chem chapter 3 vocab
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12 Terms
proton
a positively charged particle found in the nucleus of an atom
electron
a negatively charged particle found outside the nucleus
isotope
atoms of the same element with different numbers of neutrons
mass number
the total number of protons and neutrons in an atom
percent abundance
the percentage of an isotope found in a natural sample
mole
a unit used to measure the amount of particles in a substance
neutron
a particle in the nucleus of an atom with no charge
atomic number
the number of protons in an atom
nuclide
a specific type of atom identified by its number of protons and neutrons
average atomic mass
the weighted average mass of all the isotopes of an element
relative abundance
the percentage of each isotope found in a natural sample
ion
an atom that has gained or lost electron, giving it a charge