Question

Which of the following is the correct condensed electron configuration for the atom or ion indicated? 

Answer 1

Configuration of noble gases is as following:-

Ne =10e- =1s2, 2s2, 2p6

Ar = 18e- = 1s2, 2s2, 2p6, 3s2, 3p6

Kr = 36e- = 1s2, 2s2, 2p6, 3s2, 3p6, 4s2,3d10, 4p6

Xe =54e- = 1s2, 2s2, 2p6, 3s2, 3p6, 4s2,3d10, 4p6, 5s2, 4d10, 5p6

Cl+ has no. of electrons = 16 = [Ne] 3s2, 3p4

Ga has no. of electrons = 31 = [Ar] 4s2,3d10, 4p1

I- has no. of electrons = 54 = [Xe]

Si4+ has no. of electrons = 10 = [Ne]

As has no. of electrons = 33 = [Ar] 4s2,3d10, 4p3

Therefore, Si4+ has no. of electrons = 10 = [Ne] is the correct answer