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All matter can be classified into elements, mixtures, and compounds.
An element is the smallest part of a substance that can exist on its own.
A mixture contains more than one substance that are chemically combined.
Dalton\’s atomic theory states that atoms are indivisible and indestructible.
Atoms of the same element can have different masses.
Sub-atomic particles include protons, neutrons, and electrons.
Protons have a relative mass of about 1/2000.
Neutrons have a relative charge of +1.
Electrons are found in the nucleus of an atom.
Hydrogen is the only atom that has no neutrons.