25 feb 1801 año - John Dalton

Descripción:

His theory specified that atoms of a given element are identical, atoms cannot subdivided, created or destroyed.
"Law of constant compositon" - in a given compound the relative number and type of atoms is constant

"Law of conversation of mass" - Matter cannot be created or destoryed

Law of multiple proportions" -when chemical elements combine, they do so in small, whole number ratios.

He combined different gases and observed their properties regarding their density and pressure.