Dalton's Atomic Theory — Overview & Modern Application

All matter is composed of atoms.

All atoms of the same element have the same mass, size, and chemical properties.

Atoms are the smallest possible unit of matter- they can't be split apart or created or destroyed.

Atoms of different elements can combine in simple whole number ratios to form compounds.

This occurs through chemical reactions, where atoms are moved, rearranged, and form new bonds, but do not change elements.