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The carbon atom is sometimes listed as carbon-12 and sometimes as carbon-14 what does this mean? PLZ HELP THIS IS URGENT

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Carbon-12 has 6 neutrons and 6 protons, making it 12.
Carbon-14 has 8 neutrons and 6 protons, making it 14.
It is used to date the age of things that are very old using radioactive isotopes.
User Rob De La Cruz
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