Question

14. The electronic
configuration of valence shell
of Cu is 30410 4s 1 and not
3019 45 2.
a) because Completely filled and
half filled orbitals have extra
stability

b) because it is as per Aufbau
principle
O
c) because it is as per Pauli's
exclusion principle
O d) none of these​

Answer 1

Answer:

a)

Explanation:

This is because an atom tends to attain stability and stability can be attained only when a subshell has half-filled and fully-filled configurations.

If Cu was 1s2 2s2 2p6 3s2 3p6 4s2 3d9, the d subshell would have only 9 electrons and it would be one short of an octet and hence would not have stability.

But since Cu has configuration 1s2 2s2 2p6 3s2 3p6 4s1 3d10, the d subshell is completely filled and hence has stability.

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Answer 2

Explanation:

option a because completely filled and half filled orbitals have extra stability