-
First person to think of an atom. Thought the atom was a circle
-
Believed that Democritus was wrong and that all matter was made up of one of the four elements. Fire, Earth, Air, and Water.
-
Believed that everything everything was mad up of atoms.
-
Came up with his own atomic theory.
All matter is made up of atoms.
Atoms cannot be made or destroyed. -False
Elements contain the same type of atoms. -False
Different elements contain different atoms.
Chemical reactions occur when atoms are rearranged.
Compounds are made up of two different elements. -
Was the first one to discover radioactivity.
-
Was the first man to discover electrons. Came up with the Plum Pudding Model. This model said that atoms were pools of plums (protons) floating in a pool of pudding (electrons).
-
Measured the charge and mass of an electron.
-
Discovered that atoms had a nucleus using his Gold Foil Experiment.
-
Created the Bohr model, which closely resembles the way the atom is depicted today.
-
Discovered isotopes.
-
Found that atoms consist of a nucleus and shells. Proved Bohr model incorrect. Created formula for finding where electrons are.
-
Discovered the Neutron.
