The number of valence electrons in a bromate ion, BrO^-3 is ?

Question

a)23, b) 24, c) 25, or d)26

help me figure out how you came up with the answer d. (d is the correct answer)

Thanx

Answer 1

O has 6 valence e-

Br has 5

and the charge on the ion is -3

Thus 3*6 + 5 + 3 = 26.