Flashcards
Developments of atomic structure
Cards in this deck (6)
- 1How did the Greeks contribute to knowledge of the atomic structure?- Greek philosopher Demokritis said that
"all matter could be divided and sub divided into smaller units until it couldn't anymore"
- ancient Greeks could not support the theory
- came up with four elements; Fire, Earth, Water and Air
- atom (atomos, greek word for indivisible) - 2How did Dalton contribute to knowledge of atomic structure?- developed/ proposed atomic theory 1800s
Conclusions;
- different elements have different masses
- all maters are made of atoms
- atoms are rearranged in a chemical reaction
- compounds are formed when 2 or more atoms join together - 3How did JJ Thompson contribute to atomic theory?- 1897
- showed atoms contained smaller pieces
- he opposed Dalton's theory that atoms couldn't be broken down - 4How did Rutherford contribute to knowledge of atomic structure in 1911?-Tested plum pudding model (tried to overturn)
- he aimed a beam of alpha particles at thin gold foil
- some alpha particles emerged at different angles, some went straight back
- some were repelled and some were deflected by the positive charge in the atom - 5How did Bohr contribute to atomic structure in 1913?- developed Rutherford's model further
- used experimental evidence to support his ideas that electrons occupy orbits/ shells around a nucleus - 6How Chadwick contribute to knowledge of atomic structure in 1935?- discovered neutrons in an atom
- found that despite having no charge they contribute to the atomic weight (in nucleus)
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- A level Chemistry Flashcards on Developments of atomic structure, created by Caitlyn Randles on 28/09/2017.
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- Caitlyn Randles
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