The electronic configuration of an elements is 1s 2 2s 2 2p 6 3s 2

CHEMISTRY

JAMB 1991

The electronic configuration of an elements is 1s²2s²2p⁶3s²3p⁶. How many unpaired electrons are there in the elements

A. 5
B. 4
C. 3
D. 2

Correct Answer: C. 3

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