History Of An Atom Flashcards
What did Democritus discover?
The smallest particle of matter;
1.atom
What did Dalton discover?
Atomic theory
What did Thomson discover?
The electron
How did Thomson discover the electron (what method)?
1.Worked with Cathode ray tubes
2.particles were deflected by magnetic and electric fields
3.they were very small and negatively charged
What does Thomson plum pudding model state?
Electrons are embedded in a blob of positive charge
What was Rutherford experiments?
Gold foil experiment
What did Rutherford discover?
Nucleus
How was Rutherford experiment revolutionary?
Atoms are mostly empty space which changed the course of atomic theory
How did Rutherford disprove Thomson’s theory?
He discovered a positively charged nucleus
What did Neil Bohr discover
Electrons exist in different energy levels
Outline Bohrs study of spectra
1.Carried out experiment using hydrogen discharge tube
2.Results series of narrow lines
3.Called line spectrum
4.Every elements has its own unique emission
What did Chadwick discover?
1.Nucleus contains TWO types of particles
2.Neutrons have no electrical charge
What did Millikan discover?
Negative charge of the electron
