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Which one of the following is not a characteristic of isotopes?

A) The isotopes of an element have the same number of protons and electrons but different numbers of neutrons

B) The isotopes of an element have same mass numbers

C) The isotopes of an element exhibit different physical properties such as density, melting point, boiling point etc.

D) The isotopes of an element possess the same electronic configuration and the same number of valence electrons and exhibit same chemical properties

E) None of these