Question

The electronic configurations of molecules change when the number of electrons is ________

(a) 10

(b) 20

(c) 17

(d) 14

This question was posed to me in class test.

The query is from Bonding in Some Homonuclear Diatomic Molecules in chapter Chemical Bonding and Molecular Structure of Chemistry – Class 11

Answer 1

Right answer is (d) 14

For explanation: The electronic configuration below number of electrons  = 14, i.e. number of electrons = 12 is σ1s^2σ*1s^2σ2s^2 σ*2s^2π2px^2π2y^2but after 14, take number of electrons = 16 is σ1s^2σ*1s^2σ2s^2σ*2s^22pz^2π2px^2π2y^2π*2px^1π*2py^1 So the change comes near 2pz orbital’s place.