Question

how many valence electrons does each atom of arsenic (as) have? arsenic is element 33. it is in period 4 and family 15 (5a or the nitrogen family).

Explanation:

Step1: Recall the valence - electron rule for main - group elements

For main - group elements, the group number (using the old 1 - 18 group numbering: groups 1 - 2 and 13 - 18) indicates the number of valence electrons.

Step2: Identify the group of arsenic

Arsenic (As) is in group 15 (or 5A in the old notation).

Answer:

5