How many unpaid electrons are in 1s2 2s2 2p6 3s2 3p6

As we can see, the first shell has its 2 electrons

the second shell has its 8 electrons

we know that the third shell also needs 8 electrons and we can see that the third shell also has 8 electrons.

Therefore, all the shells of this atom are filled and this atom is stable

So we can say that there are no unpaired electrons

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