The Development Of The Atom Flashcards
Who created the idea of atoms?
Democritus 450-370 BC
Who discovered the electron and when? And what model was used?
Thomson in 1897
Plum pudding model in 1904
Atom made up a ball of positive charge with electrons dotted around inside it
Who discovered the nucleus and when? How?
Rutherford, 1911, Rutherford model
Gold foil experiment, alpha particles were shot at the gold foil but 1 in 10000 were reflected
Who discovered the shell and when?
Bohr 1913, bohr model
A gas can be made to produce its own light
Who discovered the neutrons and when?
Chadwick, 1932
What other conclusions did Rutherford make?
Atom is mostly made of empty space
The nucleus is positively charged
Electrons orbit the nucleus
Nucleus is atleast 10000 times smaller than an atom
Protons
What other conclusions did bohr make?
The further away an electron is from the nucleus, the more energy it has
When an electron loses energy, electromagnetic radiation is emitted
An electron can gain energy by absorbing electromagnetic energy
