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Question

The electronic configuration of lithium atom is .

A
2,1
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B
1,2
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C
2,4
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D
2,3
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Solution

The correct option is A 2,1
Atomic number of an atom is equal to the number of protons in an atom. For a neutral atom, the number of protons is equal to the number electrons.

The innermost shell of an atom can accommodate a maximum of two electrons and the second shell can accommodate a maximum of eight electrons.

Atomic number of lithium (Li) is 3. Hence, lithium has 3 electrons and its electronic configuration is 2,1.

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