Which pair of elements have the same valence electronic configuration of np³? (a)O and Se (b)Ge and Pb (c)P and Sb (d)K and Mg (e)Al and Ga

(c) P and Sb

Explanation:

We can determine the number of valence electrons of an element:

Which pair of elements have the same valence electronic configuration of np³?

(a) O and Se. NO. They belong to the group 16 and the valence electron configuration is ns² np⁴.

(b) Ge and Pb. NO. They belong to the group 14 and the valence electron configuration is ns² np².

(c) P and Sb. YES. They belong to the group 15 and the valence electron configuration is ns² np³.

(d) K and Mg. NO. They belong to the groups 1 and 2 and the valence electron configuration is ns¹ and ns².

(e) Al and Ga. NO. They belong to the group 13 and the valence electron configuration is ns² np¹.

fe 55.85 g/mol and h2o 18.02 g/mol.