Dalton’s 5 postulates (no true order)

Dalton’s first postulate

Elements are composed of small indivisible particles called atoms

Dalton’s second postulate

All atoms of a given element have identical properties

Dalton’s third postulate

Atoms cannot be created or destroyed. Conservation of mass.

Dalton’s fourth postulate

Compounds form with atoms combined in small whole number ratios. Law of multiple proportions

Dalton’s fifth postulate

Relative number of atoms are constant in a given compound. Constant composition.