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

1 Answer
Dr. Hayek
May 3, 2016

Group 1.

Explanation:

In an electron configuration under the general form of ns^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 1s^1, 2s^1 and 3s^1 respectively. They are all group 1 elements however, the period number is different; 1, 2 and 3 respectively.

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