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Name An Element In The Fourth Period (row) Of The Periodic Table With Five Valence Electrons.

A molecular approach 3rd edition nivaldo j. Tro chapter 8 problem 49e. When we take a look at the fourth energy level or period (row) of the periodic table, we can see that arsenic is in group $ 17 $ and belongs to the fourth energy level. The electron structure of arsenic is $ \left[ {ar} \right]4{s^2}3{d^{10}}4{p^3} $ arsenic's $ s $ and $ p $ orbitals each have two electrons, with a total of five valence.