Assertion :Lithium (Li) have 1 valence electron. Reason: The number of electrons in the outermost (valence) shell are called the valence electrons.
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion The number of electrons in the outermost (valence) shell are called the valence electrons. Example: Atomic number of lithium (Li) is 3 with electronic configuration 2,1. The number of valence electrons is1.