Hello,

Hydrogen does not contain neutron, because its nucleus is compact in size which cannot lodge any heavier neutron. It also makes hydrogen atom unstable in nature.

Hydrogen has three isotopes. The most lavish isotope protium has no neutrons whereas the isotopes found in small quantities have 1 neutrons respectively.

Thank you.

Hello Aspirant!!!

One basic proposed explanation is that Hydrogen does not contain neutron, because its nucleus is smallest in size which cannot accommodate any heavier neutron. It also makes hydrogen atom unstable in nature. It happens only in case of 1H1.

But other than the above mentioned formula, Hydrogen exist as Isoptopes namely Deuterium (2H1) which contains 1 proton and 1 neutron. Whereas in case of Tritium (3H1) the number of proton remains same but it contains 2 neutrons.

Hope it helps!!!