What is Dalton's First Principle? It'll be helpful to list the other three as well, but the FIrst Principle is my first priority.

1. Chemical elements are made from immutable "atoms" and these atoms do not change even when they participate in a chemical reaction.

2. Since elements are made of immutable atoms, therefore all atoms of a particular element are identical.

3. Chemical compounds form when atoms combine in simple numerical ratios.