1 янв 1803 г. - John Dalton

Описание:

Dalton came up with an atomic theory that had five main laws.
1-All elements are made up of atoms and these atoms are indestructible and indivisible.
2-Atoms of the same element have the same mass and chemically act the same way.
3-Each element is determined by the mass of atoms.The atoms in different elements are all different. They have different masses and different chemical properties.
4-When two or more atoms join together they make a compound element.
5-Atoms can't be created or destroyed by a chemical change.