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the variable controlled by the researcher. Also the variable that is dependent on another variable: the independent variable.
the sum of the number of protons and neutrons (the nucleons) in the nucleus of an atom. It...
reactions that either simultaneously occur in both directions or that can be reversed by...
a group of elements that are non-reactive, monatomic gases (Group 0, 8 or 18).
the mass of a formula unit relative to one atomic mass unit.