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The following atoms are all variations of the element carbon: 12C, 13C, and 14C due to differing

numbers of neutrons. What are these variations called?
A. Isotopes
B. Polymers
C. Molecules
D.Isomers

User Swandog
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Isotopes.
Some isotopes of elements that are not usually radioactive are radioactive because they don't have a suitable number of neutrons. For example carbon-12 is stable but carbon-14 is radioactive. Carbon-12 is much more common.
User Massab
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