Simple Model of the Atom (AQA GCSE Chemistry): Flashcards
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Practise the cards
13 cards from this deck
What was the early atomic model?
What was the early atomic model?
Tiny solid spheres that cannot be broken down
What discovery led to the plum pudding model?
What discovery led to the plum pudding model?
Electrons
Describe the plum pudding model structure
Describe the plum pudding model structure
Positive sphere with electrons scattered throughout
Alpha scattering: what did most particles do?
Alpha scattering: what did most particles do?
Passed straight through the atom
Why did some alpha particles bounce back?
Why did some alpha particles bounce back?
Hit dense, positive nucleus
What did alpha scattering show about atoms?
What did alpha scattering show about atoms?
Atoms are mostly empty space
Nuclear model: where is the atom's mass?
Nuclear model: where is the atom's mass?
Tiny positive nucleus at centre
Who improved the nuclear model?
Who improved the nuclear model?
Niels Bohr
Bohr's key discovery about electrons
Bohr's key discovery about electrons
Move in fixed orbits at specific distances
What are protons?
What are protons?
Positively charged particles in nucleus
What are neutrons?
What are neutrons?
Particles with no charge in nucleus
Who discovered neutrons?
Who discovered neutrons?
James Chadwick
When were neutrons discovered after protons?
When were neutrons discovered after protons?
About 20 years later