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

Helium

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Lithium

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Protium

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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 $H_{1}^{1}$ . Its atomic number is 1 and its mass number is also 1. So it does not possess any neutron.
Whereas,
Helium, $H e_{2}^{4}$ , has 2 neutrons
Lithium, $L i_{3}^{7}$ , has 4 neutrons
Tritium, $H_{1}^{3}$ , has 2 neutrons

The correct option is $C$ .

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