Draw all the atomi structure electronic configuation of valency of first 20 elements
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Explanation:
Atomic number 20 is of Calcium -
Electronic configuration – 1s2 2s2 2p6 3s2 3p6 4s2.
Group - It belongs to second group.
Period – It belongs to 4th period.
Valency – Valency of calcium is +2
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