Give reason: First period in the modern periodic table contains only – InterviewSolution

1.	Give reason: First period in the modern periodic table contains only two elements.
Answer» Elements present in the first period i.e., H and He contain only one shell which is also their valence shell and can accommodate maximum two electrons. As first shell can accommodate only two electrons, first period ends at He which has a complete duplet. Hence, first period in the modem periodic table contains only two elements.

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