Do different isotopes of an atom retain the properties of the atom?

Answer 1

Different isotopes retain almost but not quite all of the chemical properties of the atom. They have different physical properties --obviously Atomic Mass--but most physical properties differ only slightly if at all. (That is why it took a massive effort during World War II to enrich uranium in its U-235 isotope enough to make an atomic bomb. The method that finally proved most efficient was gaseous diffusion, using a gaseous halide of uranium; the diffusion rate of molecules varies with molecular mass, and many hundreds of stages were required to succeed.) The most noticeable differences in physical properties are between H-1 and H-2, and some chemical kinetic properties have been shown to be different as a result.

Answer 2

Yes, different isotopes of an atom have the same chemical properties because they all have the same number of protons. However, isotopes may have different physical properties, such as different atomic masses and radioactive behaviors.