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Abundance and Isotopes

Name an atom ...

Question

Name an atom which does not contain all three subatomic particles - proton, electron and neutron.

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Solution

Hydrogen has three isotopes called protium, deuterium and tritium. Out of these protium is ${}_{1}^{1}H$ , which has only one proton, neutron and no electrons.
Thus hydrogen is an atom that does not contain all three subatomic particles - proton, electron, and neutron.

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