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Question

Which of the following can be found in the second period?

A
Potassium
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B
Lithium
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C
Uranium
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D
Helium
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E
Magnesium
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Solution

The correct option is D Lithium
Lithium can be found in the second period. The outer electronic configuration of Li is 2s1. Thus, the last electron enters 2s orbital.

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