Q. 23 A4.3( 23 Votes )

(i) Write the electronic configurations of the following ions:

(a) H (b) Na+

(c) O2–

(d) F

Answer :

The electronic configuration of ions refers to representation of electrons in the various energy shells and subshells more collectively called as orbits of the atom.


[a] H- ion


The electronic configuration of H atom is 1s1. [Atomic number = 1]


Electronic configuration of H- = 1s2


[b] Na+ ion


The electronic configuration of Na atom is 1s2 2s2 2p6 3s1. [Atomic number = 11]


Electronic configuration of Na+ = 1s2 2s2 2p63s0 Or 1s2 2s2 2p6


[c] O2- ion


The electronic configuration of 0 atom is 1s2 2s2 2p4. [Atomic number = 8]


Electronic configuration of O2- ion = 1s2 2s2 p6


[d] F- ion


The electronic configuration of F atom is 1s2 2s2 2p5. [Atomic number = 9]


Electron configuration of F- ion = 1s2 2s2 2p6


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