Name an element which does not contain neutrons.

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Solution

Neutrons :
Neutrons are present at the center of the nucleus.
They are the important constituent of the mass number of an atom.
They are neutral in nature.
Every element contains neutron except Hydrogen.
Hydrogen :
Hydrogen is written as ${}_{1}^{1}H$ .
It has mass number one and its atomic number is also one.
It does not contain neutrons.
It contains one electron and one proton.
Hence, Hydrogen does not contain neutrons.

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