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Glossary of Atoms, Elements, and Compounds

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substance with a pH less than 7
acid
state of matter with no definite shape or volume
gas
state of matter that has definite volume but no definite shape
liquid
substance with a definite shape and volume
solid
substance with a pH greater than 7
base
substance formed of atoms from two or more elements
compound
subatomic particle with a positive electric charge
proton
subatomic particle with no electric charge
neutron
negatively charged subatomic particle
electron
number of protons in an atom
atomic number
smallest unit of a pure substance that still has all the properties of the substance
atom
center of an atom, surrounded by a cloud of electrons
nucleus

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