Models of the atom (AQA GCSE Physics Combined Science): Flashcards
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What caused atomic models to change over time?
What caused atomic models to change over time?
New experiments giving fresh evidence
Who created the plum pudding model?
Who created the plum pudding model?
J.J. Thomson
What was the structure of the plum pudding model?
What was the structure of the plum pudding model?
Positive charge with negative electrons scattered throughout
Who created the nuclear model of the atom?
Who created the nuclear model of the atom?
Ernest Rutherford
What did Rutherford fire at gold foil?
What did Rutherford fire at gold foil?
Alpha particles
Unexpected result in gold foil experiment
Unexpected result in gold foil experiment
A few alpha particles bounced straight back
What did bouncing alpha particles prove?
What did bouncing alpha particles prove?
Atom has tiny, dense, positive nucleus
What are the positive particles in the nucleus?
What are the positive particles in the nucleus?
Protons
Who discovered neutrons?
Who discovered neutrons?
James Chadwick
Who created the energy levels model?
Who created the energy levels model?
Niels Bohr
Key feature of Bohr model
Key feature of Bohr model
Electrons orbit in specific/fixed energy levels
What electrons do when they gain/lose energy
What electrons do when they gain/lose energy
Jump between energy levels