Question

11 How many electrons are there in the valence
shell of a copper atom? | तांबे के परमाणु के आबंध
चक्र में कितने इलेक्ट्रान होते हैं?
VA 1
B 2
C8
D 18​

Answer 1

Answer:

(b) - 2....

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Answer 2

Answer:

Option A) 1

Explanation:

Copper has atomic number of 29.

The valence she'll of copper is at 4th shell, which comprises of 4s and 4p shells.

The expected electronic configuration of copper is :

${1s}^{2} {2s}^{2} {2p}^{6} {3s}^{2} {3p}^{6} {4s}^{2} {3d}^{10}$

but the actual electronic configuration of copper is :

${1s}^{2} {2s}^{2} {2p}^{6} {3s}^{2} {3p}^{6} {4s}^{1} {3d}^{10}$

This happens in order to attain full stability of d-orbitals.

thus, the valence electron present is only 1.