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12<br />
C<br />
14<br />
C<br />
mass number<br />
13<br />
C<br />
• Carbon occurs naturally in three<br />
isotopes.<br />
• All of these atoms have the same<br />
number of protons but different<br />
numbers of neutrons.<br />
• The number of neutrons and protons<br />
determines the mass, so the masses<br />
are different.<br />
• 14 C is radioactive.
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