History of the atom

Question 1

Atomic theory
- Democritus (500 B.C)

Answer 1

Everting is made up of tiny little particles that can’t be broken down any further .

• Democritus (500 B.C)

Question 2

Solid spheres
- John Dalton (1800’s)

Answer 2

Diffrent types of spheres made up the different elements .

• John Dalton (1800’s)

Question 3

The Plum Pudding Model
- JJ.Thomson (1897)

Answer 3

Atoms contained negatively charged particles (Electrons).

Energy ball full of positive charge
Discrete Electrons

• JJ.Thomson (1897)

Question 4

Nuclear Model
- Ernest Rutheford (1909)

Answer 4

Instead of a general field of positive charge there was some sort of compact nuclues which contained all the positive charge and then negative charge on the outside .

• Ernest Rutheford (1909)

Question 5

Electron Shells
- Niels Bohr

Answer 5

Orbiting of electrons prevents the Atom from collapsing.

• Niels Bohr

Question 6

Protons

• Ernest Rutherford

Answer 6

Discovered that the positive charge in the nucleus is made up of small discrete particles (protons)

• Ernest Rutherford

Question 7

Neutral particles

• James chadwick

Answer 7

provided evidence for neutral particles in the nucleus (Neutrons)

• James Chadwick