Chemical properties are determined by the number of protons and electrons an atom of an element has. An isotope only differs in the number of neutrons it has. read more
The different isotopes of an element have the same number of protons basically. The number of electrons can also be common in all but it has a certain condition. An Isotope can be ion and if and only if the isotope is electrically neutral, it has same number of electrons too. read more