Give reason: First period in the modern periodic table contains only two elements.
Give reason:
First period in the modern periodic table contains only two elements.
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- 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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