History of the Atom (AQA GCSE Chemistry Combined Science): Flashcards
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Who first published a scientific theory about atoms? (Year?)
Who first published a scientific theory about atoms? (Year?)
John Dalton (1803)
How did Dalton describe atoms?
How did Dalton describe atoms?
Indivisible and indestructible spheres
Who discovered the electron?
Who discovered the electron?
J.J. Thomson
When was the electron discovered?
When was the electron discovered?
1897
What was Thomson's atomic model called?
What was Thomson's atomic model called?
Plum pudding model
Description of plum pudding model
Description of plum pudding model
Ball of positive charge with negative electrons scattered throughout
Year of Rutherford's gold foil experiment
Year of Rutherford's gold foil experiment
1909
What Rutherford fired at gold foil
What Rutherford fired at gold foil
Alpha particles (positively charged)
Main finding: what happened to most alpha particles?
Main finding: what happened to most alpha particles?
Passed straight through the foil
What passing through indicated about atoms
What passing through indicated about atoms
Atoms are mostly empty space
What happened to a small number of alpha particles?
What happened to a small number of alpha particles?
Deflected in various directions
What was Rutherford's atomic model called?
What was Rutherford's atomic model called?
Nuclear model
Key feature of nuclear model
Key feature of nuclear model
Mass concentrated in central, positively charged nucleus