Question

The elements which contain same atomic number but different atomic masses is called what of the following term?​

Answer 1

Answer:

Atoms of the same element having the same atomic number but different mass are called isotopes. They have same number of protons and electrons but different number of neutrons. For example: Hydrogen - protium (11H), deuterium (12H) and tritium (13H) are isotopes.

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Answer 2

Answer:

For many of the chemical elements there are several known isotopes. Isotopes are atoms with different atomic masses which have the same atomic number. The atoms of different isotopes are atoms of the same chemical element; they differ in the number of neutrons in the nucleus.