1.2 Flashcards
Who was the first to propose atoms?
Greek philosophers
- matter canbe divided into indestructible (atoms)
What did democritus believe?
Matter subdivided to tiny indestructible atoms
Atoms come in different sizes
What is dalton’s theory?
① matter has tiny invisible particles
② same element = identical
③ different element = different
Law of multiples porportions
By mass elements combine to form.
Who discovered plum pudding model?
Thomson
Thomson’s greatest discovery
Electron is - charged
Explain cathode ray tube
Rays travel intube with high voltage and last moving electros excite gas and glow .
What was rutherforddiagram?s
Planetary
Who did gold tin experiment? And describe
Rutherford, aimed light at gold foil and realized it my being reflected off since there was nuclerses
What is the oil drop experiment
To find electron
Oil drop in high voltage pulled down by gravity to calculate change
How were electron energy levels discovered?
Electricty and thermal energy applied to h2 gas
Chadwick describe what he thought?
Confirmed neucli has neutron and proton
Also, neutron = neutral
How did chadwick discover neucli
There was radiation emitted by beryllium
