Question

complete the passage.
k (potassium) belongs to group ia of the periodic table, and has 1 valence electron. br (bromine) belongs to viia, and has valence electrons.

Explanation:

In the periodic table, elements in group VIIA (also known as group 17) have 7 valence electrons. This is a fundamental property of elements in this group. Bromine (Br) is an element in group VIIA, so it follows this rule.

Answer:

7