P1.1.1 - The Model Of The Atom 1 Flashcards
What does the word ‘atomos’ mean in Greek?
Indivisible
What did Democritus and Leucippus think about atoms?
There would be a point where you couldn’t cut anymore and that would be an atom
What did the dalton model look like?
A very small indestructible sphere
What did dalton think about atoms?
All the atoms in an element are the same
The atoms in one element are different from all the atoms in other elements
When was the dalton model created?
1870
What did dalton do experiments about to get his results?
Measuring how elements combined
What are cathode rays?
Rays given out by hot metals
What did Thomson discover?
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
When did Thomson’s investigation take place?
1897
What did Thomson make sense of?
An atom contains negatively charged electrons
Overall, an atom has an overall neutral charge
When was the plum pudding model introduced?
1904
What does the plum pudding model suggest?
That the atom consists of positive mass with negative electrons embedded in it
What did thomson not know about the atom?
The structure of the atom
What the positive mass was made of
