The science of matter, its properties, and is interactions.
Anything that occupies space and has mass.
A substance that cannot be broken down into simpler substances by chemical reactions.
The smallest unit of an element that can exist either alone or in combination.
That part of the atom that has a negative charge and that moves in a shell-like orbit around the nucleus.
An atom or group of atoms that has a positive or negative charge as a result of losing or gaining electrons.
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