Atomic and Mass Numbers
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4 Terms
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What is mass number?
MASS NUMBER (or RELATIVE ATOMIC MASS/RAM) is the number of PROTONS + NEUTRONS in a nucleus. (The bigger number)
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What is the atomic number?
ATOMIC NUMBER is the number of PROTONS in a nucleus. e.g carbon atoms always have 6 protons. An ATOM must also have this number of ELECTRONS in order to be neutral. If not, it is an ION instead.
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Why are some mass numbers not whole numbers?
These are an AVERAGE mass of all isotopes.
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What are isotopes?
ISOTOPES: Same element, different numbers of neutrons.
Note 
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