Isotopes of an element have-

Correct option is C

The correct answer is (c) Different number of neutrons.
· Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.
· Isotopes have the same atomic number (because they have the same number of protons), but they have different mass numbers due to the difference in the number of neutrons.
· Isotopes generally exhibit the same chemical properties because they have the same electron configuration, which determines chemical behavior.
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· Physical properties of isotopes can differ slightly, especially in terms of mass-dependent properties like diffusion rate.
· Chemical properties are almost identical for isotopes because chemical reactions depend on electron arrangement, which remains the same.
· Examples: Carbon-12 and Carbon-14 are isotopes of Carbon. Both have 6 protons, but Carbon-12 has 6 neutrons, and Carbon-14 has 8 neutrons.