isotopes

Question

Two isotopes of an element differ in:

RankGuru · Accepted Answer

1. **Definition**: Isotopes are variants of a particular chemical element which differ in **neutron number ($N$)**. 
2. **Nucleus Composition**: 
   - Protons ($Z$): Same.
   - Neutrons ($N$): Different.
3. **Impact on Mass**: Because $A = Z + N$, isotopes have different **mass numbers ($A$)**.
4. **Chemical vs Physical**: Since they share the same number of electrons and protons, they have nearly identical chemical properties but different physical properties (like stability/radioactivity).

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Isotopes are nuclei with same?