Question

an element has an electron configuration of 1s²2s²2p⁶3s¹. using the above figure, which letter would be in the same group?
o w
o x
o y
o z

Explanation:

Step1: Determine the group from electron - configuration

The electron configuration $1s^{2}2s^{2}2p^{6}3s^{1}$ indicates an element in group 1. Elements in group 1 have 1 valence electron in an s - orbital.

Step2: Identify the position in the periodic - table representation

In a periodic - table representation, elements in the same group are in the same vertical column. X is in the first vertical column which represents group 1.

Answer:

B. X