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Carbon-14

Carbon-14: atomic number 6, mass number 14, with 6 protons and 8 neutrons.

IsotopeC
146C
Protons6
Neutrons8
Electrons (neutral)6

The proton count fixes the element: 6 protons identify Carbon. Mass number 14 is the total number of protons and neutrons.

A neutral Carbon-14 atom also has 6 electrons. Changing neutrons changes the isotope; changing electrons changes the charge.