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Question

Which amongst the following does not have neutrons in their atom?

A

Protium

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B

Deuterium

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C

Tritium

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D

Helium

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Solution

The correct option is A

Protium


Protium, deuterium and tritium are the isotopes of hydrogen.
Generally an element is represented as AZX, where A is the mass number and Z is the atomic number of the element X.
The above isotopes are represented as:
Protium- 1 1H, Deuterium- 21H, Tritium - 31H
Also, mass number (A) = Atomic number (Z) + Number of neutrons

The number of electrons, protons and neutrons in each of the given atoms are given below.
AtomElectronsProtonsNeutrons (A-Z)Protiumoneone1-1=0Deuteriumoneone2-1=1Tritiumoneone3-1=2Heliumtwotwo4-2=2
For protium, number of neutrons is zero.
So, it is the only atom which does not contain a neutron.

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