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11 Cards in this Set

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An average value based on the relative abundance of the element's isotopes.
atomic mass
a member of a set of atoms of the same element whose nuclei contain the same number of protons but different numbers of neutrons
isotope
the number of nucleons (protons & neutrons) in the atomic nucleus. Used to identify isotopes.
mass number
an electrically neutral subatomic particle of the atomic nucleus.
neutron
any subatomic particle found in the atomic nucleus. Another namefor either a proton or neutron.
nucleon
a positively charged subatomic particle of the atomic nucleus.
proton
a count of the number of protons in the atomic nucleus.
atomic number
an extrememly small, negatively charged subatomic particle found outside the atomic nucleus.
electron
the dense, positively charged center of every atom.
atomic nucleus
a law stating that matter is neither created or destroyed in a chemical reaction.
law of mass conservation
a law stating that elements combine in definite mass ratios to form compounds.
law of definite proportions.