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Write down the electronic configuration ...

Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following questions with explanation.
`""_1H,""_7Na,""_20Ca,""_16S,""_4Be,""_18Ar`. Which of these elements belong to the second group?

Text Solution

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From the above electronic configurations, elements Calcium (Ca) and Beryllium (Be) have same number of valence electrons, i.e. 2, therefore Calcium and Beryllium belong to group 2. We can infer from this that the group follows the trend of same valence electrons.
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