History of the atom chem project, group1

Front

He thought different materials had different kinds of atoms (for example, smooth and round ones for liquids, rough and jagged ones for solids).

Back

Democritus

Front

• Discovered the electron using a cathode ray tube(vacuum)

• Found that electrons are negatively charged particles.

• Said atoms contain positive and negative charges.

Back

J.J. Thomson

Front

• Greek philosopher

• Believed matter is made of tiny, indivisible particles

• 400 B.C.

Back

Democritus

Front

said Atoms can’t be created nor destroyed, only rearranged.

Back

John Dalton

Front

• Discovered the nucleus, a dense positive center and found that atoms are mostly empty space.

Back

Ernest Rutherford

Front

He created the Plum Pudding Model which is a model that's supposed to help describe the insides of an atom

Back

J.J. Thomson

Front

He proposed that electrons orbit the nucleus, later on made a model. Soon after, his student improved said model.

Back

Ernest Rutherford

Front

• Proposed the first atomic theory based on experiments.

• Said atoms are tiny, solid spheres that can’t be divided.

Back

John Dalton