An atom has a valence shell electron configuration of ns^1ns1. To which group of elements in the periodic table does it belong?

1 Answer
May 3, 2016

Group 1.

Explanation:

In an electron configuration under the general form of ns^1ns1, the nn represents the period number and the 11 represents the group number, and therefore, the element would be in group 1.

Example,
""_1H:1s^11H:1s1

""_3Li:1s^(2)2s^(1)3Li:1s22s1

""_11Na:1s^(2)2s^(2)2p^(6)3s^(1)11Na:1s22s22p63s1

Hydrogen, Lithium and sodium electron configuration end with 1s^11s1, 2s^12s1 and 3s^13s1 respectively. They are all group 1 elements however, the period number is different; 1, 2 and 3 respectively.

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