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Question

Which element among the following normally exist as monoatomic molecules?

A
Cl
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B
H
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C
O
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D
N
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E
He
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Solution

The correct option is E He
He normally exist as monoatomic molecules.
It is a noble gas and is chemically inert.
It has completed its valence shell (with 2 electrons in 1s orbital) and has no tendency to combine with other elements.

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