Question

. two elements which have the same atomic number

Answer 1

Answer:

Isotopes are atoms of the same element (that is, with the same number of protons in their atomic nucleus), but having different numbers of neutrons. Thus, for example, there are three main isotopes of carbon.

Explanation:

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Answer 2

Answer:

Atoms that have the same atomic number, but different mass numbers are called isotopes. Let's take the three naturally occuring isotopes of hydrogen as an example. In order for an atom to be a hydrogen atom, it need to have exactly one proton in its nucleus.

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