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Question
Answer the following question.
The electronic configuration of some element is given below:
1s2
In which group and period of the periodic table the element is placed?
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Solution
1s2
Here n = 1. Therefore, the element belongs to the 1st period.
The outer electronic configuration 1s2 corresponds to the maximum capacity of 1s, the complete duplet.
Therefore, the element is placed at the end of the 1st period in group 18 of inert gases in the modern periodic table.
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