Which isotope of hydrogen has two neutrons?

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Multiple Choice

Which isotope of hydrogen has two neutrons?

Explanation:
Isotopes differ in the number of neutrons in the nucleus while the number of protons stays the same. For hydrogen, all isotopes have one proton, so the difference comes from neutrons. Protium has no neutrons, deuterium has one neutron, and tritium has two neutrons. So the isotope with two neutrons is the hydrogen-3 form, known as tritium.

Isotopes differ in the number of neutrons in the nucleus while the number of protons stays the same. For hydrogen, all isotopes have one proton, so the difference comes from neutrons. Protium has no neutrons, deuterium has one neutron, and tritium has two neutrons. So the isotope with two neutrons is the hydrogen-3 form, known as tritium.

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