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the smallest particle of an element


a combination of two or more atoms

chemical bond

the force that holds two atoms together


a substance that cannot be broken down into other substances by chemical or physical means


a substance made of two or more elements chemically combined

atomic mass

the average mass of one atom of an element

periodic table

a chart of the elements showing the repeating pattern of there properties


the central core of an atom containing protons and neutrons


a small, positively charged particle in the center of and atom


a small particle in the nucleus of an atom,with no charge (neutral)


a tiny, negatively charged particle that moves around the nucleus of an atom

atomic mass unit (amu)

a unit used to measure the mass of particles in atom

atomic number

the number of protons in the nucleus of an atom

chemical symbol

a one or two letter represantation of an element


elements in the same vertical column of the periodic tabel
(also called group)


a horizontal row of elements in the periodic table

valence electron

one of the electrons farthest away from the nucleus of the atom
involved in chemical reactions

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