isotopes definition

Question

Isotopes are nuclei with same?

RankGuru · Accepted Answer

1. **Definition**: **Isotopes** are atoms of the same element that have the same number of protons but different numbers of neutrons.
2. **Atomic Number ($Z$)**: Protons define the atomic number and chemical identity. Thus, isotopes have the **same atomic number**.
3. **Mass Number ($A$)**: Since mass number $A = Z + N$ (protons + neutrons), and $N$ varies, isotopes have **different mass numbers**.
4. **Example**: Hydrogen-1 ($1p, 0n$), Deuterium ($1p, 1n$), and Tritium ($1p, 2n$) are isotopes of Hydrogen.

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isotopes definition

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