20 déc. 1808 - Billiard Ball Model

Description:

1808, Dalton thought atoms were the smallest particles of matter, he thought they were solid, hard spheres, like billiard balls, so he used wooden balls to model them. He basically made up the concepts,
All substances are made of atoms. Atoms are the smallest particles of matter. They cannot be divided into smaller particles, created, or destroyed.All atoms of the same elements are alike and have the same mass. Atoms of different elements are different and have different masses.Atoms join together to form compounds, and a given compound always consists of the same kinds of atoms in the same proportions.