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Isotopes of an element have
(a) The same physical properties
(b) Different chemical properties
(c) Different number of neutrons
(d) Different atomic numbers.
Answer :
Isotopes of an element have
(c) Different number of neutrons
EXPLANATION
Isotopes are elements having same atomic number but different mass number. As mass number of an element depends upon the number of neutrons, so isotopes of an element have different number of neutrons.
Mass number = Number of neutrons + Atomic number