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Question

Which of the following elements are isotopes

A
C12
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B
C13
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C
C14
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D
N14
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Solution

The correct options are
A C13
B C12
C C14
Isotopes any of two or more forms of a chemical element, having the same number of protons in the nucleus, or the same atomic number, but having different numbers of neutrons in the nucleus, or different atomic weights.
C12, C13, C14 are having same number of protons i.e 6, so they are isotopes.
Hence, options A, B & C are correct.

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