Isotopes of an element have
(a) the same physical properties
(b)the same chemical properties
(c)different number of neutrons
(d) different atomic numbers.

Correct answer: (b) the same chemical properties and (c) different number of neutrons.

Explanation: Isotopes of an element have the same number of protons but different numbers of neutrons. Example: Carbon 12 and Carbon 14 are isotopes of Carbon.

Isotopes of the same element possess distinct physical properties (such as boiling and melting points) as their mass numbers are different. Hence, option (a) is incorrect.

The chemical property of any element is due to the number of electrons and spatial arrangement of electrons. It does not depend on the neutrons. Isotopes of an element possess a similar number of electrons or protons but distinct numbers of neutrons. So all isotopes have the same chemical properties. Hence, option (b) and (c) is correct.

The number of protons in a nucleus determines the element's atomic number on the Periodic Table. Hence, option (a) is incorrect.


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