Question

select the correct answer. which of these elements has two valence electrons? a. hydrogen (h) b. barium (ba) c. nitrogen (n) d. krypton (kr) e. bromine (br)

Explanation:

Hydrogen has 1 valence electron. Nitrogen has 5 valence electrons. Krypton is a noble - gas with 8 valence electrons. Bromine has 7 valence electrons. Barium is in Group 2 of the periodic table and has 2 valence electrons.

Answer:

B. barium (Ba)