The element with an electron configuration of [tex]1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 4 s^2 3 d^2[/tex] is in group
The element with an electron configuration of [tex]1 s^2 2 s^2 2 p^6 3 s^2 3 p^6[/tex] is in group and period



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