Question

why is hydrogen, a nonmetal, placed in the same group as alkali metals? a because it has eight valence electrons like the other elements in group 1. b because it has just one valence electron like all the other elements in group 1. c because it has two valence electrons like all the other elements in group 1. d because it has just one valence electron like all the other elements in group 2.

Explanation:

Hydrogen is placed in group 1 of the periodic table with alkali - metals because it has one valence electron like all the other elements in group 1. Valence electrons play a major role in determining the chemical properties and group placement of elements.

Answer:

b. Because it has just one valence electron like all the other elements in group 1.