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Science
8th Grade
10/23/2012
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Term
Protons
 Definition
A positively charged particle
Term

Neutrons

 Definition
a particle with no charge
Term
Atomic mass
 Definition
a unit of mass that describes the mass of an atom
Term
Atomic number
 Definition
the number of protons in the nucleus
Term
isotope
 Definition
an atom that the number of protons is different amount  of neutrons
Term
mass number
 Definition
the sum of the protons and neutrons
Term
atomic mass
 Definition
the mass of an atom in atomic mass units
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