Question

Which rule does not support the following electronic configuration, and
write the rule
O(Z =8)
1s²
2s²
2p⁴​

Answer 1

Answer:

2p⁴

Hund's rule doesn't support this. According to Hund's rule electron pairing in orbital starts only when all available empty orbitals of same energy are singly occupied. Here, in 2p subshell, pairing started without electrons filling the other orbitals.

Answer 2

Aufbau Principle is violated as the orbital having lower energy must be filled first. So 1s could not be vacant in 1s

0

2s

2

2p

4

.

An electron having the lowest value of (n+l) will be filled first.