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Question

Which of the following atom has no neutron in its nucleus ?

A
Helium
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B
Lithium
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C
Protium
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D
Tritium
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Solution

The correct option is B Protium
Protium is the most abundant isotope of hydrogen with an abundance of almost 99%. It's symbol is H11. Its atomic number is 1 and its mass number is also 1. So it does not possess any neutron.
Whereas,
Helium, He42, has 2 neutrons
Lithium, Li73, has 4 neutrons
Tritium, H31, has 2 neutrons

The correct option is C.

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