Dalton's Atomic Theory

Principle 1

Each element is made up of tiny

particles called atoms.

Principle 2

The atoms of a given element are

identical; the atoms of different elements

are different in some fundamental way or

ways.

Principle 3

Chemical compounds are formed

when atoms of different elements

combine with each other. A given

compound always has the same relative

numbers and types of atoms.

Principle 4

Chemical reactions involve

reorganization of the atoms—changes in

the way they are bound together. The

atoms themselves are not changed in a

chemical reaction.