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The hydrogen isotope ; protium. It has one proton and one electron only.

However the other two isotopes of hydrogen do contain all three sub-atomic particles.

Deuterium ; one proton, one neutron and one electron.

Tritium ; one proton, two neutrons, and one electron.

All three isotopes are Hydrogen because they all contain ONE proton.

The most common isotope is protium , which is casually thought of a hydrogen.

Deuterium (D) is 'heavy hydrogen' and used in the nuclear industry.

Tritium (T) is 'super heavy hydrogen' and is radio active and the rarest isotope of hydrogen.

NB All other atoms of elements in the Periodic Table contain protons, neutrons and electrons.

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lenpollock

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13y ago

Hydrogen.

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Q: What atom does not have all three subatomic particles?
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