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# How to find electronic configuration of atoms? Give the full study materials.

Asked by Tony Innocent 25th October 2013, 2:15 PM

To find electronic configuration of atoms, you should know its atomic numbers.

For electronic configuration of elements, the most important thing that you should be aware of -

The order in which orbitals of different subshells are filled. We know that this order is determined by the (n + l) rule and is as follows:

Order for filling subshells: 1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d 7p

where the number indicates the energy level and the letter indicates the subshell being filled.

Maximum number of electrons in each subshell: s=2, p=6, d=10, f=14

A superscipt number after the letter of the subshell shows how many electrons occupy that subshell.

The helium atom has 2 electrons, both in the s subshell of the first energy level.
Its sub-shell electron configuration is 1s2

The neon atom has 10 electrons.
2 electrons in the s subshell of the first energy level: 1s2
8 electrons in second energy level, made up of 2 electrons in an s subshell and 6 electrons in a p subshell: 2s2 2p6
Its subshell electron configuration is 1s2 2s2 2p6

The argon atom has 18 electrons.
2 electrons in the s sub-shell of the first energy level: 1s2
8 electrons in the second energy level made up of 2 electrons in an s subshell and 6 electrons in a p subshell: 2s2 2p6
8 electrons in the third energy level made up of 2 electrons in an s subshell and 6 electrons in a p subshell: 3s2 3p6
Its subshell electron configuration is: 1s2 2s2 2p6 3s2 3p6

Table showing examples of electronic configuration of atoms and ions are as follows:

 Atom Z No. Electrons = Z Subshell Electron Configuration Ion No. Electrons = Z - charge Subshell Electron Configuration H 1 1 1s1 H- 1 - (-1) = 2 1s2 He 2 2 1s2 Li 3 3 1s2 2s1 Li+ 3 - 1 = 2 1s2 Be 4 4 1s2 2s2 Be2+ 4 - 2 = 2 1s2 B 5 5 1s2 2s2 2p1 B3+ 5 - 3 = 2 1s2 C 6 6 1s2 2s2 2p2 C4+ 6 - 4 = 2 1s2 N 7 7 1s2 2s2 2p3 N3- 7 - (-3) = 10 1s2 2s2 2p6 O 8 8 1s2 2s2 2p4 O2- 8 - (-2) = 10 1s2 2s2 2p6 F 9 9 1s2 2s2 2p5 F- 9 - (-1) = 10 1s2 2s2 2p6
Answered by Expert 26th October 2013, 11:15 PM
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