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Standard VIII
Chemistry
Isotopes and Isotones
Question

Isotopes differ in :
  1. Atomic number
  2. Mass number
  3. Valence electrons
  4. Chemical properties

A
Mass number
B
Chemical properties
C
Valence electrons
D
Atomic number
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Solution
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Atoms having same atomic number but different atomic mass, are known as isotopes.

The difference in the mass is due to the difference in their number of neutrons with the same number of electrons and protons.

Hence the correct option is D.

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