Atomic Model Development (P1) Flashcards
1
Q
Democritus
A
400 B.C.
Everything is composed of invisible and indestructible atoms
2
Q
Dalton
A
1803
He realised that different elements were different sizes and masses
3
Q
Thomson
A
1897
Plum pudding model- positive could with electrons dotted around it
4
Q
Rutherford
A
1911
Used the Geiger-Marsden experiment to see that the way electrons were deflected proved a dense positive core
5
Q
Bohr
A
1913 saw that there was a nucleus surrounded by electrons in shells
6
Q
Chadwick
A
1932
Discovered that the nucleus contained neutrons as well as protons
7
Q
Mendeleev- periodic table
A
Arranged the elements in order of relative atomic mass, noticed a periodic trend
