Question

why do all isotopes of an element have the same chemical properties? how are isotopes of an element different?

Explanation:

Chemical properties are determined by the number of electrons. Isotopes of an element have the same number of protons and electrons, so they have the same chemical properties. They differ in the number of neutrons, which affects their mass but not chemical behavior.

Answer:

All isotopes of an element have the same chemical properties because they have the same number of electrons. They are different in the number of neutrons.