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Question

Zn (30) : 1s22s22p63s23p63d104s2
How to find valency of zinc by electronic configuration?

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Solution

Zn(30):1s22s22p63s23p64s23d10
K shell can accomodate upto 2 electrons.
L shell can accomodate upto 8 electrons
M shell can accomodate upto 18 electrons
Now, total electrons in K,L and M shells =2+8+18=28
Remaining 2 electrons can be lost to complete its octet thats why its valency will 2

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