Question

Select the corect subshell electronic configuration of our from the following a) 1s2 2s2 2p6 3s2 3p6 3d4 4s2 b) 1s2 2s2 2p6 3s2 3p6 3d5 4s1​
give reasons

Answer 1

Answer:

b

Explanation:

in this is electronic configuration of chromium we get [Ar]3d5 4s1 instead of [Ar]3d4 4s2

chromium get this configuration to attain half filled d orbital which gives extra stability to it. so in this case one electron from 4s go to 3d to make it stable