Question

Number of isotopes of carbon is :

• A. $3$
• B. $4$
• C. $5$
• D. $6$

Answer 1

Answer: (A)

$3$

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 are called isotopes.

Number of isotopes of carbon are 3.They are $C_6^{12}$,$C_6^{13}$ and $C_6^{14}$
Hence option A is correct.