Carbon 12, carbon 13, carbon 14 are examples of ?

Carbon 12, carbon 13, carbon 14 are examples of isotopes of carbon atom.

Explanation:

Isotopes are elements or atoms having similar atomic number but different mass number. In carbon atoms, Carbon 12 has six protons and six neutron, Carbon 13 has six protons and seven neutron and Carbon 14 has six protons and eight neutrons. In carbon isotopes, proton numbers are the same but neutron numbers increases.

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