2. History of the atom and how it came to be Flashcards
What did Democritus believe?
Democritus believed that all things made of matter were also then made up of small particles called atoms. Atoms couldn’t be smaller than what they were.
What theory did John Dalton come up with?
The theory that John Dalton came up with was that atoms could not be created, destoyed or be made smaller within a chemical process.
JJ Thomson discovered the … in 1897.
JJ Thomson discovered the electron in 1897.
Who created the plum pudding model and why?
JJ Thomson created the plum pudding model and believed that the atom was a positiley charged body with electrons scattered around the body.
The theoy of the atom consisting of a nucleus was intorduced by…
This theory was introduced by Ernest Rutherford. He suggested that inside the nucleus were protons, surronded by electrons orbiting in shells.
What is mmost of the atom made of and who introduced this?
Most of the atom is made up of empty space and this was introudced by Ernest Rutherford.
Niels Bohr said that electrons could only … with ….. .
Niels Bohr said that electrons could only orbit with certin energy levels. The levels for the first 20 elements are 2, 8, 8, 2.
Who discovered the neutron and when?
Sir James Chadwick discovered the neutron in 1932.
