Which of the following best represents the characteristic properties of isotopes?
The chemical properties of isotopes are similar, but their physical properties are different.
Isotopes of an element have the same atomic number but different mass numbers, so they differ in the number of neutrons.
Chemical behaviour is decided by the number and arrangement of electrons, which is the same for all isotopes of an element, so their chemical properties are similar.
Physical properties such as mass, density and rate of diffusion depend on the mass number, so these differ - for example protium, deuterium and tritium.
Hence, the answer is that the chemical properties of isotopes are similar, but their physical properties are different.
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