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Question:

Which element has an atom in the ground state with a total of three valence electrons?

A)aluminumB)lithiumC)phosphorusD)scandium

Answer:

AAluminum has 3 valence electrons lithium, a group 1 atom has 1 valence electron; phosphorus a member of group 15 has 5 valence electrons, and scandium has 2 valence electrons

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