World 1 · Atoms & Bonds · 5 minSame element, different isotope
Neutrons and mass number
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Mass number counts protons plus neutrons. Isotopes have the same proton count but different neutron counts. Carbon-12 has six of each; carbon-14 has six protons and eight neutrons.
Check yourself
Carbon-14 has 6 protons. How many neutrons does it have?
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