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Question

Identify the element which has no neutron in its nucleus.

A
Helium
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B
Hydrogen
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C
Argon
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D
Lithium
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Solution

The correct option is B Hydrogen
Hydrogen is the only element which has no neutrons in its electronic structure. It has only one proton and one electron. Its mass number is 1.
Mass numbers of helium, argon and lithium are 4, 40 and 7 respectively.

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