the smallest unit of an element that maintains the properties of that element.

a subatomic particle that has a positive charge and that is found in the nucleus of an atom

in physical science,an atom's central region, which is made up of protons and neutrons.

a substance that cannot be separated or broken down into simpler substances by chemical means.

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Distinguish between molecules and atoms

Term	Definition
atom	the smallest unit of an element that maintains the properties of that element.
proton	a subatomic particle that has a positive charge and that is found in the nucleus of an atom
nucleus	in physical science,an atom's central region, which is made up of protons and neutrons.
element	a substance that cannot be separated or broken down into simpler substances by chemical means.