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A

accuracy

how closely a measurement aligns with a correct value

actinide

inner transition metal in the bottom of the bottom two rows of the periodic table

alkali metal

element in group 1

alkaline earth metal

element in group 2

alpha particle

positively charged particle consisting of two protons and two neutrons

anion

negatively charged atom or molecule (contains more electrons than protons)

atom

smallest particle of an element that can enter into a chemical combination

atomic mass

average mass of atoms of an element, expressed in amu

atomic mass unit

unit of mass equal to 1/12 of the mass of a carbon-12 atom

atomic number

number of protons in the nucleus of an atom

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