Question

how many number of unpaired electrons are present in sodium, chlorine, nitrogen, calcium

Answer 1

Hi there!

In Sodium - there is only ONE free electron.
In Chlorine - there is only ONE free electron.
In Nitrogen - there are THREE free electrons (1 Pair and one single)
In Calcium - there are TWO free electrons (1 Pair)

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Hope this helps!

Answer 2

in Na 1 e- present
in Cl 7 e- present
in N 3 e- present
in Ca 2 e- present