The Atom: From Philosophical Idea to Scientific Theory

All matter is composed of atoms.

Atoms of a given element are identical in size, mass, and other

Atoms cannot be subdivided, created, or destroyed.

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

definite proportions

multiple proportions

definite proportions

conservation of mass

atomic theory

multiple proportions

Atoms can change identity in chemical reactions.

Atoms can be split into subatomic particles.

Atoms can be destroyed by chemical reactions.

Some atoms of a particular element are identical to atoms of other elements.