# An atom has a valence shell electron configuration of ns^1. To which group of elements in the periodic table does it belong?

May 3, 2016

Group 1.

#### Explanation:

In an electron configuration under the general form of $n {s}^{1}$, the $n$ represents the period number and the $1$ represents the group number, and therefore, the element would be in group 1.

Example,
""_1H:1s^1

""_3Li:1s^(2)2s^(1)

""_11Na:1s^(2)2s^(2)2p^(6)3s^(1)

Hydrogen, Lithium and sodium electron configuration end with $1 {s}^{1}$, $2 {s}^{1}$ and $3 {s}^{1}$ respectively. They are all group 1 elements however, the period number is different; 1, 2 and 3 respectively.