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Atomic Theory

Across
Something that takes up space
A chemical substance that cannot be broken-down into any simpler substances by chemical reactions.
All matter is made up of tiny indivisible particles.
A property of a physical body
Down
A subatomic particle, symbol p+
The smallest constituent unit of ordinary matter that has the properties of a chemical element.
A subatomic particle, symbol e−
A minute fragment or quantity of matter
Composed of two or more separate elements; a mixture.
A subatomic particle, symbol n0