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nucleus
the center of he atom that contains all of the mass and all of the positive charge
atom
the basic unit of a chemical element, meaning it is the smallest piece of matter that retains the characteristic properties of that element
proton
the subatomic particles with a positive charge in the nucleus
neutron
a subatomic particles with mass equal to the proton but no charge, in the nucleus
electron
a subatomic particles with a negative charge, outside the nucleus
atomic number
number of protons in the nucleus for each element
on periodic table
mass number
the total mass of an individual atom, equal to the sum of the protons plus the neutrons