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A carbon-12 atom has 6 protons, 6 neutrons, and 6 electrons. How many protons does a carbon-14 atom have?
The number of protons in an atom establishes the identity of the atom. This number, "" does not change for any given element.
The number of neutrons in an atom is variable, gives extra mass to the atom and is refered to as an "isotope".
The "" on is a weighted average based on the abundance of each isotope of an element.