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As a result of the Lewis and Clark expedition
Mass Number
Number of protons plus the number of neutrons in each atom.
Neutrons
Subatomic particles found in the nucleus of an atom that have no electric charge.
Mass Number
The total number of protons and neutrons in an atom's nucleus, indicating the mass of the atom.
Atomic Number
The number of protons in the nucleus of an atom, which determines the chemical properties of an element.
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