Question

Identify the period and group of the element that has the electron configuration 1s22s22p63s23p3.

Answer 1

The answer is D
The electrons are found on three shells (hence period 3) and on the third shell there are (2 + 3) electrons hence group 5A.  Also, the element is Phosphorous (P)

Answer 2

Period 3, Group 5A or P... use your periodic table to count. When I first learned this I colored the S group the P group, D and F groups different colors. Group 1 A and Group 2 A are S. Groups 3A to 8A are P. The B's or transition metals are D And the lanthanide series and actinide series are F. Then count left to right.