Q.

Isotopes are atoms having the same atomic number but different _________.

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a

Number of nuclei

b

Atomic mass

c

Valency number

d

Mass number

answer is A.

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Detailed Solution

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  • Isotopes are atoms of the same element with the same number of protons in their nucleus, but they differ in the number of neutrons, which gives them different atomic masses. 
  • Since isotopes have the same number of protons, they have the same atomic number and exhibit the same chemical properties.
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