Historical models of the atom (AQA GCSE Chemistry Combined Science): Flashcards
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What was the early atomic model?
What was the early atomic model?
Tiny, solid spheres that cannot be split
What was the original meaning of 'atom'?
What was the original meaning of 'atom'?
Indivisible - cannot be cut into smaller parts
Plum pudding model structure
Plum pudding model structure
Positive sphere with electrons stuck inside
Discovery that led to plum pudding model
Discovery that led to plum pudding model
Electrons (tiny negative particles)
Alpha particle experiment main finding
Alpha particle experiment main finding
Most particles went straight through atoms
What alpha experiment showed about atoms
What alpha experiment showed about atoms
Atoms are mostly empty space
Nuclear model key feature
Nuclear model key feature
Tiny, positive central core called nucleus
Bohr's model: electron position
Bohr's model: electron position
Orbit nucleus at specific/fixed distances
What are protons?
What are protons?
Positive particles in the nucleus
What are neutrons?
What are neutrons?
Neutral particles (no charge) in nucleus
Who discovered neutrons?
Who discovered neutrons?
James Chadwick
Why was neutron discovery important?
Why was neutron discovery important?
Explained why atoms heavier than expected from protons/electrons
When do scientific models of atoms change?
When do scientific models of atoms change?
When new experimental evidence is discovered