P1.1.1 - Model Of The Atom 1

Question 1

What does the word ‘atomos’ mean in Greek?

Answer 1

Indivisible

Question 2

What did Democritus and Leucippus think about atoms?

Answer 2

There would be a point where you couldn’t cut anymore and that would be an atom

Question 3

What did the dalton model look like?

Answer 3

A very small indestructible sphere

Question 4

What did dalton think about atoms?

Answer 4

All the atoms in an element are the same

The atoms in one element are different from all the atoms in other elements

Question 5

When was the dalton model created?

Answer 5

1870

Question 6

What experiments did dalton do to get his results?

Answer 6

Measuring how elements combined

Question 7

What are cathode rays?

Answer 7

Rays given out by hot metals

Question 8

What did Thomson discover?

Answer 8

Cathode rays were made of particles that have less than one - thousandth of the mass of a hydrogen atom.
He discovered a particle called an electron that was inside the atom.
He worked out the charge of an electron particle is negative

Question 9

When did Thomson’s investigation take place?

Answer 9

1897

Question 10

What did Thomson make sense of?

Answer 10

An atom contains negatively charged electrons

Overall, an atom has an overall neutral charge

Question 11

When was the plum pudding model introduced?

Answer 11

1904

Question 12

What does the plum pudding model suggest?

Answer 12

That the atom consists of positive mass with negative electrons embedded in it

Question 13

What did thomson not know about the atom?

Answer 13

The structure of the atom and

What the positive mass was made of