Isotopes of an element have
The correct answer is (c) different neutrons. Isotopes of an element have the same number of protons and electrons but different numbers of neutrons. This results in the same chemical properties but slightly different physical properties, such as mass and density, due to neutron variation.
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(c) Isotopes of an element have different atomic masses. As the number of protons is the same, number of neutrons is different.
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