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Question

Constituents of nucleus of three atoms A, B and C are given below:
A - 90 protons and 148 neutrons
B - 92 protons and 146 neutrons
C - 90 protons and 146 neutrons
Based on the above data, which of these atoms are isotopes?

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Solution

Atoms of an element with same atomic number but different mass number are called isotopes.
Here, A and C are isotopes because they have same number of protons and differenent number of neutrons.

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