History Of Atoms Flashcards
1
Q
What was the first atomic model ?
A
- The plum pudding
- By J.J. Thompson in 1904
2
Q
What part of the plum pudding model represents the electrons ?
A
- The chunks of plum inside the pudding
3
Q
What did the cake part of the plum pudding represent
A
- A ball of positive charge
4
Q
Why and why was the plum pudding model proven wrong ?
A
- During an alpha particle scattering experiment (consisted of firing positively charged alpha particles at a thin sheet of gold)
- They predicted that most of the particles would go straight through but this wasn’t the case so they concluded that the model must be inaccurate.
5
Q
Who created the nuclear model ?
A
- Niels Bohr
6
Q
What was Niels Bohrs idea?
A
- That electrons orbit the nucleus in shells and that each shell is a fixed distance from the nucleus.
7
Q
Was Bohrs theory proven correct ?
A
- Yes through many experiments.
8
Q
Who discovered neutrons ?
A
- James Chadwick. 20 years after scientists agreed that atoms have nuclei.
9
Q
What did Rutherford discover ?
A
- That nuclei can be decided into positive charges
- He named these protons
