The atom having the valence shell configuration 3s2 3p3 would be:

A. Group 3A, Period 5

B. Group 5A, Period 3

C. Group 7A, Period 4

D. Group 3A, Period 3

Answer: - B. Group 5A, period 3.

Explanations: - From the given electron configuration the element has 5 electrons in outer most shell. It tells us the element is present in group 5A.

Value of principal quantum number is three which is the number written in front of s and p in the electron configuration and it tells us about the period number. The number is 3 means element is present in period 3.

So, the right answer is, B. group 5A, period 3.