Atoms (Leaving Cert Physics): Flashcards
📚Flashcards
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Practise the cards
13 cards from this deck
How many atoms fit across a full stop?
How many atoms fit across a full stop?
About 2 million atoms
Number of different known elements
Number of different known elements
118
Who discovered electrons and when?
Who discovered electrons and when?
J.J. Thomson in 1897
Thomson's plum pudding model structure
Thomson's plum pudding model structure
Positive sphere with embedded electrons
Who developed the nuclear atomic model?
Who developed the nuclear atomic model?
Ernest Rutherford (1911)
What particles did Rutherford fire at gold foil?
What particles did Rutherford fire at gold foil?
Alpha particles
Gold foil thickness in Rutherford's experiment
Gold foil thickness in Rutherford's experiment
2000 atoms thick
Main observation in gold foil experiment
Main observation in gold foil experiment
Most alpha particles passed straight through
What did Rutherford prove atoms contain mostly?
What did Rutherford prove atoms contain mostly?
Empty space
What particles are in the atomic nucleus?
What particles are in the atomic nucleus?
Protons and neutrons
Radius of atomic nucleus
Radius of atomic nucleus
metres
Radius of entire atom
Radius of entire atom
metres
How much smaller is nucleus vs atom?
How much smaller is nucleus vs atom?
100,000 times smaller