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atom
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S8P1.a

TermDefinition
atom the smallest unit of an element that maintains the properties of that element.
element a substance that cannot be separated or broken down into simpler substances by chemical means.
nucleus in physical science, an atom's central region, which is made up of protons and neutrons.
proton a subatomic particle that has a positive charge and that is found in the nucleus of an atom.
neutron a subatomic particle that has no negative charge.
electron a subatomic particle that has a negative charge.
atomic number the number of protons in the nucleus of an atom; the atomic number is the same for all atoms.
neutral having no overall charge.
atomic mass the mass of an atom expressed in atomic mass.
chemical symbol a one- or two-letter code that represents an element.
Created by: 24shepar
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