Question

Why do the isotopes of same elements have similar chemical properties ?

Answer 1

Because Chemical properties depend on the electrons and not on the neutrons or protons . In isotopes the number of electrons are the same, so chemical properties are also same.

Answer 2

The properties of an element are determined by the number of protons in the nucleus. Isotopes have a different number of neutrons in the nucleus. ... Isotopes of an element have the same number of electrons as an atom of that element.