Answer :

The subshells in which electrons are filled in the s block elements of the third period are 1s,2s,2p,3s.

18Ar– 1s2 2s2 2p6 3s2 3p6


The s block elements of the third period are Na and Mg. So 1s,2s,2p,3s are the subshells in which electrons are filled.


The last element of third period is Argon which has atomic number 18.



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