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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