Changes in the Atomic Model (AQA GCSE Physics Combined Science): Flashcards
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Practise the cards
15 cards from this deck
When were electrons discovered?
When were electrons discovered?
1897
What the plum-pudding model suggested
What the plum-pudding model suggested
Ball of positive charge with negative electrons embedded
Material used in alpha-scattering experiment
Material used in alpha-scattering experiment
Gold foil (a few atoms thick)
Charge of alpha particles
Charge of alpha particles
Positive
Main observation from alpha-scattering experiment
Main observation from alpha-scattering experiment
Most alpha particles passed straight through
What atoms are mainly made of (alpha-scattering conclusion)
What atoms are mainly made of (alpha-scattering conclusion)
Empty space
What deflection of alpha particles showed
What deflection of alpha particles showed
Centre of atom has positive charge
What alpha particles bouncing back showed
What alpha particles bouncing back showed
Centre contains a great deal of mass (nucleus)
Key feature of Bohr's model
Key feature of Bohr's model
Electrons orbit nucleus at specific distances
Terms for electron orbits in Bohr's model
Terms for electron orbits in Bohr's model
Energy levels or shells
Who discovered neutrons
Who discovered neutrons
James Chadwick
Why atoms have no overall charge
Why atoms have no overall charge
Number of electrons equals number of protons
Radius of an atom
Radius of an atom
nm ( m)
Radius of the nucleus
Radius of the nucleus
m
Relative charge of proton, neutron, electron
Relative charge of proton, neutron, electron
+1, 0, -1