What do carbon-12, carbon-13, carbon-14 have in common? how are they different? what do you call these 3 types of atoms?

Part 1.

Carbon-12, Carbon-13, Carbon-14 have in common = Proton number.

They all are natural isotopes of carbon.

Carbon-12: 6 protons.Carbon-13: 6 protons.Carbon-14: 6 protons.Part 2.

They are different on the basis of mass numbers, neutron numbers and properties related to atomic masses.

Carbon-12: 6 neutron,   12 mass number.Carbon-13:  7 neutron,   13 mass number.Carbon-17:  8 neutron,   14 mass number.Part 3.

We call these 3 types of atoms isotopes of carbon.

An isotope is a form of a chemical element whose atomic nucleus contains Same number of protons but different numbers of neutrons.So according to the definition of isotopes, these all three elements are isotopes of carbon.

It was ernest rutherford