Sr(NO3)2\mathrm{Sr}\left(\mathrm{NO}_{3}\right)_{2}Sr(NO3)2. Electron Configuration describes how the electrons are distributed in an atom's orbitals. Do atoms react to fill outer shell or 8 valence electrons? The Aufbau principle is thatthe electrons present in the atom will first complete the lowest energy orbital and then gradually continue to complete the higher energy orbital. The lowest energy level electron orbitals are filled first and if there are more electrons after the lowest energy level is filled, they move to the next orbital. As: 4s 2 4p 3, S: 3s 2 3p 4; Mo: 4s 2 4p 6 4d 5 5s 1; V: 3s 2 3p 6 3d 3 4s 2; and W: 5s 2 5p 6 5d 4 6s 2; these electrons were assigned to the valence space. What are the number of sub-levels and electrons for the first four principal quantum numbers? Identify each substance as a molecular compound or an ionic compound, and then calculate its molar mass. Hunds rule specifies the order in which electrons are filled in all subshell orbitals. The 3d orbital is now full. So the total number of orbitals at n=3 energy level is 9. the filled 3d subshell effectively withdraws from chemistry and the subsequent trend looks much like trends in the periods 2 and 3. See all questions in Orbitals, and Probability Patterns. As a result, the Ne electron configuration is 1s2 2s2 2p6. Px, Py, Pz. Electrons, however, are not simply floating within the atom; instead, they are fixed within electronic orbitals. 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p There are no known elements that, in their ground state, have electrons in a subshell beyond 7p. And the arrows () are drawn inside the box to represent electrons. 8 Multiple Choice 2 8 00:09:34 O 4 eBook 0 5 2 This problem has been solved! are known. The values of $m_s$ are $m_s=\pm \frac{1}{2}$. Your answer should look like this: (Ne)2s^22p^6; yes OR (Ne)2s^22p^5; no. Each orbital can have a maximum of two electrons. According to this principle, electrons are filled in the following order: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p An orbital can only hold two electrons with opposite spins, according to the, This principle can be stated another way: ". I am in high school so please try to simplify your answer and use fairly basic terms. This configuration conveys a lot of important information about an element. The electron configuration of selenium shows that the last shell of selenium has six electrons. The first ionisation potential (in eV) of Be and B, respectively are, Identify the wrong statement in the following, Among the elementsCa,Mg,P and Cl, the order of increasing atomic radii is. According to Hunds principle, the first electron will enter in the clockwise direction and the next electron will enter the 1s orbital in the anti-clockwise direction. How should the electron configuration for neon be written? So draw two arrows in the 1s box showing two electrons as follows: 2s2 indicates that the 2s subshell has 2 electrons. The distribution of electrons in an atom's orbitals is referred to as its electronic configuration. Therefore, the next two electrons enter the 2s orbital. Step #1: find electrons of selenium Step #2: write electron configuration of selenium Step #3: draw orbital diagram of selenium Let's break down each step in detail. So as there are 3 orbitals so p orbital can occupy at the maximum 6 electrons regardless of principle quantum no.. m L of a 1.5 M CaCl 2 solution . We know that the values of the quantum number l determine the number of subshells. Does chromium have 4 electron shells? How many valence electron does a carbon atom have? As with oxygen or sulfur, selenium needs to gain only 2 electrons to fill its 4p orbital to capacity. Learn more about Stack Overflow the company, and our products. The quantum number determines the number of angular nodes; there is 1 angular node, specifically on the xy plane because this is a pz orbital. Although the details of the structure of monoclinic sulphur are not well known it probably consists of, 2023 Collegedunia Web Pvt. You can also see that: Each orbital can hold two electrons. Since there are only two allowed values of spin, thus there can only be two electrons per orbital. The following table lists all of the possible subshells for n values up to 4: As a result, the 1p, 2d, and 3f orbitals do not exist because the value of the azimuthal quantum number is always less than the value of the principal quantum number. 5. So draw four arrows in the 4p box showing four electrons as follows: Thats it! 5, paramagnetic (odd numbers are always paramagnetic). Thus, to find the number of electrons possible per shell. 1.How many electrons can be put in each of the following: (a) a shell with principal quantum numbern; (b) a subshell with quantum numbersnandl; (c) an orbital; (d) a spin-orbital? Which of the following has magic number of protons and neutrons? 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Before drawing the orbital diagram, you should know the three general rules. Hence the electronic configuration for Cl- ion will be. The main proponents of this principle are scientists Niels Bohr and Pauli. Then two electrons will enter the 3s orbital and the next six electrons will be in the 3p orbital of the third orbit. and correspond to differently shaped volumes of space in which the probability of finding the electrons is high. To write the orbital diagram of selenium(Se), you have to do the electron configuration of selenium. Fe2+ The electronic configuration of Fe is 1s22s22p63s23p63d64s2 . For the fourth shell, $n=4$, so the allowed values of $\ell$ are: $\ell=0$, which is the $s$ subshell, $\ell=1$, which is the $p$ subshell, $\ell=2$, which is the $d$ subshell, and $\ell=3$, which is the $f$ subshell. Based off of the given information, n=4 and. (3 marks). Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. (Cs, Ga, K, Bi, As), As (2 marks). . So draw ten arrows in the 3d box showing ten electrons as follows: 4p4 indicates that the 4p subshell has 4 electrons. Chemistry Stack Exchange is a question and answer site for scientists, academics, teachers, and students in the field of chemistry. s-orbitals can hold 2 electrons, p-orbitals can hold 6, and d-orbitals can hold 10, for a total of 18 electrons. Within each subshell, electrons are grouped into orbitals, . The $p$ subshell has dumbbell-shaped orbitals. The energy of an orbital is calculated by adding the principal and azimuthal quantum numbers. For Fe2+ 2 electrons are removed from the 4s orbital so the resultant configuration is : 1s22s22p63s23p63d6 . Atomic electron configurations follow a standard notation in which all electrons containing atomic subshells are placed in a sequence (with the number of electrons they hold written in superscript). The $s$ subshell has one orbital for a total of 2 electrons, The $p$ subshell has three orbitals for a total of 6 electrons, The $d$ subshell has five orbitals for a total of 10 electrons, The $f$ subshell has seven orbitals for a total of 14 electrons, The $g$ subshell has nine orbitals for a total of 18 electrons, The $h$ subshell has eleven orbitals for a total of 22 electrons, The first shell only has the $s$ subshell $\implies$ 2 electrons, The second shell has the $s$ and $p$ subshells $\implies$ 2 + 6 = 8 electrons, The third shell has the $s$, $p$, and $d$ subshells $\implies$ 2 + 6 + 10 = 18 electrons, The fourth shell has the $s$, $p$, $d$, and $f$ subshells $\implies$ 2 + 6 + 10 + 14 = 32 electrons, The fifth shell has the $s$, $p$, $d$, $f$, and $g$ subshells $\implies$ 2 + 6 + 10 + 14 + 18 = 50 electrons, The sixth shell has the $s$, $p$, $d$, $f$, $g$, and $h$ subshells $\implies$ 2 + 6 + 10 + 14 + 18 + 22 = 72 electrons, $n$, the principle quantum number defines the shell. Thus the $p$ subshell has three orbitals. What are the three rules to be followed at the time of writing the electronic configuration of elements? The number of atomic orbitals in a d subshell is. So, the next two electrons will enter the 4s orbital and ten electrons will enter the 3d orbital. Therefore, the electron configuration of selenium(Se*) in an excited state will be 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4px1 4py1 4pz1 4dxy1. How many electrons can the 4p subshell hold for an atom? Ques. Ques. The electron configuration of selenium is [ Ar] 4s 2 3d 10 4p 4. Atoms can jump from one orbital to another orbital in an excited state. If the lobe lies along the xy plane, then it is labeled with a xy such as dxy. The second floor has the room styles s and p. The s is a closet with one bed as we know and the p room is a single with three beds in it so the second floor can hold a total of 8 electrons. Your email address will not be published. The sub-energy level s can hold a maximum of two electrons, p can hold a maximum of six electrons, d can hold a maximum of ten electrons, and f can hold a maximum of fourteen electrons. For example, in the dyx orbital, there are nodes on planes xz and yz. The electron configuration of selenium ion(Se2-) is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6. An easy way to visualize this is like this: The pattern of maximum possible electrons = $2n^2$ is correct. around the world. Im Farhan Sadik. p has 3 orbitals and d subshell has 5 orbitals. The atomic number of selenium is 34. atom this electron must go into the lowest energy subshell available the 3 s orbital giving a 1 s 2 2 s 2 2 p 6 3 s 1 configuration , referring to figure 2 1 1 draw an orbital diagram to represent those valence orbitals following hunds rule place . Each letter is paired with a specific value: An orbital is also described by its magnetic quantum number (m). Because each orbital is different, they are assigned specific quantum numbers: 1s, 2s, 2p 3s, 3p,4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p. The number of sub-shells will be 5 but 4s, 4p, 4d, and 4f in these four subshells it is possible to arrange the electrons of all the elements of the periodic table. For $\ell=3$, $m_\ell$ has seven possible values: $m_\ell=-3,-2,-1,0,+1,+2,-3$. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 5s 2 4d 10 5p 5. Thus n=1 shell can hold two electrons. To maximize the total spin, the electrons in orbitals with only one electron all have the same spin (or the same values of the spin quantum number). Electrons in atoms are defined by 4 quantum numbers. And Paulis exclusion principle is that the value of four quantum numbers of two electrons in an atom cannot be the same. It is expressed by l. How many orbitals are there in the 4p subshell? (2 marks). Radial nodes are spheres (at fixed radius) that occurs as the principal quantum number increases. For the first shell, $n=1$, so only one value of $\ell$ is allowed: $\ell=0$, which is the $s$ subshell. The numbers 1s 2s 2p 3s 3p represent electron orbital energy levels. The orbital for which the value of (n + l) is lower is the low energy orbital and the electron will enter that orbital first. So draw two arrows in the 2s box showing two electrons as follows: 2p6 indicates that the 2p subshell has 6 electrons. When walking up stairs, you place one foot on the first stair and then another foot on the second stair. Question: How many electrons are in the 4p subshell of selenium? The orbitals are px, py, and pz and each orbital can have a maximum of two electrons. The elements that receive electrons and form bonds are called anions. An element's electronic configuration is a symbolic representation of how its atoms' electrons are distributed across different atomic orbitals. Required fields are marked *. Electron configuration through orbitals follows different principles. The orbital diagram of selenium shows that the 1s subshell has 2 electrons, the 2s subshell has 2 electrons, the 2p subshell has 6 electrons, the 3s subshell has 2 electrons, the 3p subshell has 6 electrons, the 4s subshell has 2 electrons, the 3d subshell has 10 electrons, and the 4p subshell has 4 electrons. The concept of electronic configuration has replaced the older concept of valency and valence electrons. What are the exceptions to electron configuration rules? Ltd. All Rights Reserved, Get latest notification of colleges, exams and news, Electronic Configuration of First 20 Elements, Classification of Elements & Periodicity Properties. The numbers, (n=1,2,3, etc.) There are two major exceptions to electron configuration: chromium and copper. The Group IV and V metals can lose either the electrons from the p subshell, or from both the s and p subshells, thus attaining a pseudo-noble gas configuration. Wiki User 2008-12-11 02:55:57. Heres how you can draw the orbital diagram of selenium step by step. When the selenium atom is excited, then the selenium atom absorbs energy. We already know that the d-subshell has five orbitals. The first shell has 1 subshell, which has 1 orbital with 2 electrons total. Print. The magnetic quantum number can range from to +. Chromium atoms have 24 electrons and 24 protons with the most abundant isotope having 28 neutrons. When n = 4, The s, p, d, and f subshells correspond to l=0, l=1, l=2, and l=3 values, respectively. For n=3 energy level we have three subshells- s,p and d subshells. The p-orbital can have a maximum of six electrons. Ans. It is positioned based on the energy of. B: Electronic Structure of Atoms, and the Periodic Table v) Exceptions to the filling rules Limit to Klechkovski's rule: inversion of 4s and 3d sublayers Example: electronic configuration of selenium (34 Se) (ground state) 3s 2 E 4p 30 electrons Inversion required 3p 3s 2p 2s 1s 18 electrons 10 lectrons 34 Se : 2p 6 3p 6 3d 10 1s 2 2s 2 4p 4 . Legal. Also, find the total number of unpaired electrons in its ground state. So three subshells s, p and d are possible at n=3 energy level. As a result, a hydrogen atom contains one electron, which is assigned to the s subshell of the first shell/orbit. Scientist Niels Bohr was the first to give an idea of the atoms orbit. Question. a. 9th ed. The Aufbau method is to do electron configuration through the sub-energy level. General Chemistry. Here, all the electron-containing subshells with their number of electrons in superscript are written in a sequence. In chemistry sublevels refer to energies associated with electrons. Print. The atomic number is the number of electrons in that element. How many electrons are in the 4p subshell of selenium se? The Group IV - VII non-metals gain electrons until their valence shells are full (8 electrons). The actual filling order is more complicated. Second, find highest energy level in electron configuration. So, the next six electrons enter the 2p orbital. Therefore, the selenium full electron configuration will be 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4. As you can see, the periodic table shown in Figure 2.6.3 provides a simple way to remember the order of filling the subshells in determining the electron configuration. Finally, the fourth energy level has a total of six electrons. There are five sub-shells, but only four of them are used by naturally occurring elements: s, p, d and f. Each sub-shell accommodates a certain number of electrons. Selenium Electron Configuration The electronic configuration is defined as the distribution of a number of electrons in the atom or molecule. The electron configuration for selenium is 1s22s22p63s23p64s23d104p4. The total number of nodes present in this orbital is equal to n-1. Is it possible to create a concave light? Ans. That is, the number of electrons in selenium is thirty-four. For any atom, there are three4p orbitals. So in this case, the valency of selenium is 2. how many electrons in an atom can have each of the following quantum number or sublevel designations? 1 b. Connect and share knowledge within a single location that is structured and easy to search. Orbitals that have the same or identical energy levels are referred to as degenerate. The LibreTexts libraries arePowered by NICE CXone Expertand are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. The maximum number of electrons that can be accommodated in a shell is determined by the principal quantum number (n). The quantum number determines the number of angular nodes in an orbital. Ans. The 2p, 3p, 4p, etc., can each hold six electrons because they each have three orbitals, that can hold two electrons each (3*2=6). The Aufbau principle states that electrons will occupy lower energy orbitals before moving on to higher energy orbitals. how many electrons are in the 4p subshell of selenium? The equation is: 1s<2s<2p<3s<3p<4s<3d<4p<5s<4d<5p<6s<4f<5d<6p<7s<5f<6d<7p. What is an example of a orbital probability patterns practice problem? As discussed in the previous section, the magnetic quantum number (ml) can range from l to +l. Chlorine has an atomic number of 17, implying that a chlorine atom has 17 electrons. We know that the subshell has 1 orbital. The second shell has 2 subshells: the $s$ subshell, which has 1 orbital with 2 electrons, and the $p$ subshell, which has 3 orbitals with 6 electrons, for a total of 4 orbitals and 8 electrons. Write the abbreviated electron configuration for the following ion, and indicate if it has a noble-gas configuration. The 4 th energy level contains 4s and 4p subshells. Create your account View this. Thus, to find the number of electrons possible per shell 322166814/www.reference.com/Reference_Desktop_Feed_Center6_728x90, The Best Benefits of HughesNet for the Home Internet User, How to Maximize Your HughesNet Internet Services, Get the Best AT&T Phone Plan for Your Family, Floor & Decor: How to Choose the Right Flooring for Your Budget, Choose the Perfect Floor & Decor Stone Flooring for Your Home, How to Find Athleta Clothing That Fits You, How to Dress for Maximum Comfort in Athleta Clothing, Update Your Homes Interior Design With Raymour and Flanigan, How to Find Raymour and Flanigan Home Office Furniture. For example the s subshell can hold a total of 2 electrons. Have you learned about quantum numbers yet? The 4p orbital holds 6 electrons. Electron Configuration For Selenium Selenium consists of 34 electrons distribution in its 4 orbits. A #4p# orbital, which is part of the #p# subshell located on the fourth energy level, can hold a maximum of two electrons. The valency of the element is determined by electron configuration in the excited state. So, the remaining electrons will enter the third orbit. Also, note that Brian's answer is good and takes a different approach. Because there is one node left, there must be one radial node. Ques. are called principal quantum numbers and can only be positive numbers. To create an orbital diagram of an atom, you first need to know Hunds principle and Paulis exclusion principle. The 2s or 2p orbital? Then the next two electrons will enter the 2s orbital just like the 1s orbital. Since each of those #p# orbitals can hold a maximum of two electrons, the #p# subshell can hold a maximum of, #3 color(red)(cancel(color(black)("p orbitals"))) * "2 e"^(-)/(1color(red)(cancel(color(black)("p orbital")))) = "6 e"^(-)#. This electron configuration shows that the selenium ion(Se2-) acquired theelectron configuration of krypton. Selenium is the 34th element in the periodic table and its symbol is Se. As is clear, the total number of unpaired electrons = 4. How many of valence electrons do the element in column. The second orbit is now full. It states that before a second electron is filled in an orbital, every orbital in a given subshell is singly occupied by electrons. Ans. Now, the 4p subshell contains a total of three 4p orbitals, 4px, 4py, and 4pz. Hopefully, after reading this article you will know the details about this topic. Each shell (or energy level) has some number of subshells, which describe the types of atomic orbitals available to electrons in that subshell. Accessibility StatementFor more information contact us [email protected] check out our status page at https://status.libretexts.org. Each subshell contains a specified number of orbitals, and each orbital can hold two electrons. The periodic table distinguishes four types of elements based on their electronic configurations. The 4s orbital is now full. The electron configuration of an atom shows how the electrons are arranged in the atoms energy levels. So draw six arrows in the 3p box showing six electrons as follows: 4s2 indicates that the 4s subshell has 2 electrons. Selenium atoms exhibit -2, +2, +4, +6 oxidation states. Therefore at the highest occupied principal energy level of "n = 4" the selenium atom contains: 2 electrons in a filled "4s" subshell. Therefore,the p subshell can accommodate a maximum of 6 electrons. Ans. This quantum number defines the shape of the orbitals (probability densities) that the electrons reside in. The important terms that are related to electron configuration writing are as follows. Which of these species make an isoelectronic pair: Cl-, O2-, F, Ca2+, Fe3+. The plane (or planes) that the orbitals do not fill are called nodes. mL of 2.0 M KCl with 50 . The number of possible values is the number of lobes (orbitals) there are in the s, p, d, and f subshells. Next, the p subshell has 6 electrons. According to the Pauli principle , no two electrons in the same atom can have the same 4 quantum numbers 31 . This means that the 1s, 2s, 3s, 4s, etc., can each hold two electrons because they each have only one orbital. The elements that have 5, 6, or 7 electrons in the last shell receive the electrons in the last shell during bond formation. Each subshell is separated by an electron orbital. 2S b. n=3, l=2 c. 6d; How many electrons in an atom can have each of the following quantum number or sublevel designations? Print. There are 5 d orbitals in the d subshell. How can this new ban on drag possibly be considered constitutional? Therefore, the electron will first enter the 1s orbital. The first two electrons of selenium enter the 1s orbital. For instance, if two electrons are filled in the first shell's 's' subshell, the resulting notation is '1s, With the help of these subshell labels, the electron configuration of magnesium (atomic number 12) can be written as 1s, This principle is named after the German word 'Aufbeen,' which means 'to build up.'. (2 marks). The general electron configuration for atoms of the halogen group is, In what group of the periodic table is the element with the electron configuration [Ar]4s^2 3d^10 4p^3. . How many d orbitals are there in the d subshell? This means there there must be two radial nodes. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Your email address will not be published. The energy is roughly like this: $$1s < 2s < 2p < 3s < 3p < 4s < 3d < 4p < 5s$$. 2003-2023 Chegg Inc. All rights reserved. The s-orbital can have a maximum of two electrons. As mentioned above, the electron configuration of selenium is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p4. Subshell labels are used to write down an atom's electron configuration. So its p subshell will be fully paired. What is the shape of an orbital with 4 radial nodes and 1 angular node in the xy plane? So, if there are open orbitals in the same energy level, the electrons will fill each orbital singly before filling the orbital with two electrons. The complete idea of the orbit is given there. The number of radial and angular nodes can only be calculated if the principal quantum number, type of orbital (s,p,d,f), and the plane that the orbital is resting on (x,y,z, xy, etc.) (Al, P, As, Sb, Na), Which one of these ions has the largest ionic radius? Thus the $d$ subshell has five orbitals. Therefore, the formula $2n^2$ holds! Hunds principle is that electrons in different orbitals with the same energy would be positioned in such a way that they could be in the unpaired state of maximum number and the spin of the unpaired electrons will be one-way. elements from the 3rd period don't fill the 3rd shell. Bulk update symbol size units from mm to map units in rule-based symbology. Each orbital has a capacity of two electrons. The 1s orbital is now filled with two electrons. What is the valency of selenium?Ans:The valency of selenium is 2, 4, and 6. A) 6 B) 8 C) 4 D) 2 E) 1 D) 2 (count the the spaces to the right) ONIZATION ENERGY (or FIRST IONIZATION ENERGY) - The amount of energy required to remove a single electron from the outer shell of an atom. Twelve electrons over the electron configuration of argon reach the . Since the atomic number of selenium is 34, the total electrons of selenium are 34. These orbitals have the same shape but are aligned differently in space. Key Terms: Electron Configuration, Electrons, Subshell, Atomic Orbitals, Quantum Number, Aufbau Principle, Hunds Rule,Electronic Configuration. Of these colors, _______ has the most energy. The values of $m_\ell$ are integers and depend on the value of $\ell$: $m_\ell = -\ell,,-1,0,1,,+\ell$, $m_s$, the spin angular momentum quantum number defines the spin state of each electron. A ground-state atom of manganese has ___ unpaired electrons and is _____. Which orbital would the electrons fill first? The electronic configuration of each element is decided by the Aufbau principle which states that the electrons fill orbitals in order of increasing energy levels. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. This is demonstrated in Figure 2. There are five sub-shells, but only four of them are used by naturally occurring elements: s, p, d and f. Each sub-shell accommodates a certain number of electrons. We can calculate the number of orbitals in each subshell using the formula: 2 + 1, Where, = azimuthal quantum number of the subshell, For s subshell, = 0For p subshell, = 1For d subshell, = 2For f subshell, = 3. Using quantum numbers to explain why the shells have the subshells they do and why the subshells have the number of orbitals they do. The ground state electron configuration of selenium is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4. The colors of the visible spectrum are red, orange, yellow, green, blue, and violet. What is the difference between your two methods? Save my name, email, and website in this browser for the next time I comment. What is the charge on the monatomic ion of nitrogen, the nitride ion? Ans. The Aufbau principle states that electrons will occupy lower energy orbitals before moving on to higher energy orbitals. What is the maximum number of electrons that can occupy? Therefore, the order of the number of electrons in each shell of the selenium(Se) atom is 2, 8, 18, 6. So each s subshell has one orbital, each p subshell has three orbitals, each d subshell has five orbitals, and each f subshell has seven orbitals. There's space for $18 \text{e}^-$ in the 3rd shell: $3s + 3p + 3d = 2 + 6 + 10 = 18$, however, elements in the 3rd period only have up to 8 valence electrons. The energy of an orbital is calculated from the value of the principal quantum number n and the azimuthal quantum number l. 4. Electron configurations help determine an atom's valence electrons, which provides insight into its chemical behaviour. For the values of l, 0 corresponds to the s subshell, 1 corresponds to the p subshell, 2 corresponds to d, and 3 corresponds to f. Each subshell is divided into orbitals, and these orbitals have . Quality education can build a beautiful society. Also, you should know the number of orbitals in each subshell. 2. So, the next two electrons will enter the 4s orbital just like the 1s orbital. (2 marks). What exactly is an element's electron configuration? Just as oxygen and sulfur anions (ions that have gained electrons) have a 2- charge, so too does selenium, which forms a selenide ion.