1.1.3 The development of the model of the atom Flashcards
1
Q
Order of scientists
A
John Dalton
JJ Thomson
Rutherford
Niels Bohr
James Chadwick
2
Q
James Dalton’s idea (3p)
A
-Atomes were tiny hard spheres that can’t be divided
-Each element was made up of identical models
- Each element has different atoms
3
Q
James Dalton’s billable model
A
- atoms are spherical and hard like billiard balls
4
Q
JJ Thompson experiments results (3p)
A
- Atoms aren’t solid spheres
- They are made up of subatomic negatively charged particles
- These were called electrons
5
Q
Plump pudding model (JJ Thompson) results:
A
- It’s suggests that an atom is a ball of positive charge with negative electrons embedded in it
6
Q
Ernest Rutherford’s gold foil experiment (2p)
A
- Positive alpha particles were fired at very thin gold foil
- the gold foil was surrounded by a detecter that detected the path of ghr alpha particles
7
Q
Expected gold foil experiment results (Rutherford)
A
All the alpha particles would go straight through
8
Q
Actual results if gold foil experiment (Rutherford)
A
- Most particles went through
- Very few bounded straight back
9
Q
Gold foil experiment conclusion (Rutherford) (3p)
A
- Most of the atoms are empty space
- There is a nucleus in the centre of the atom
- The nucleus is positively charged with clouds of negative electrons orbiting it
10
Q
Bohr’s idea (2p)
A
- Electrons orbit the nucleus at fixed distances from the nucleus
- They orbit in different energy levels/shells
11
Q
Chadwick’s discovery
A
- He discovered the neutron
- Neurons are found inside the nucleus with protons
12
Q
Who discovered the electron?
A
JJ Thompson
13
Q
Who discovered the neutron
A
Chadwick’s
14
Q
Who discovered the proton
A
Rutherford
