What chemical elements are called isotopes? Give examples of hydrogen isotopes.

Elements that have the same charge number and different mass numbers are called isotopes.For example, there are three isotopes of a hydrogen atom in nature: protium (1 (1) H) – a hydrogen atom contains only one proton, heavy hydrogen – deuterium (2 (1) H ) whose nucleus consists of a proton and a neutron, and tritium (3 (1) H), the nucleus of which includes a proton and two neutrons.

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