-
He is known for his atomic theory that states, that everything is composed of atoms and that atoms are indestructible units.
-
He was against Democritus' believe of the atom being indivisible.
-
Stated that matter conserves its mass even after chemical reactions. Creating the law of Conservation of Matter.
-
Dalton produced the first useful atomic theory of matter. He expressed that atoms where the indivisible particles of matter. And he concluded that atoms of the same element are the same while atoms of different elements are different.
-
Goldstein discovered that atoms had positive charges.
-
Thomson discovered the electrons. He declined Dalton's model of the atom being indivisible. And he stated that the electrons must be surrounded by a positive charge around the outside. His model was called the "Plum pudding model".
-
He determined the mass of an electron and its electric charge.
-
He suggested a new model, he said the positive charge should be focused in the center, or the nucleus.
-
He discovered the atomic number. Discovered that the protons on the nucleus were different for each element, and that each element had a unique positive charge.
-
Bohr suggested that electrons moved in orbits surrounding the nucleus.
-
Erwin and Werner developed a mathematical description for the way the electrons would orbit around the nucleus. They developed the Wave Mechanical formula which became the basic model for modern atomic theory.
-
Discovered that the nucleus contained a non charged particle, called the neutron.
