Changes in the Atomic Model (OCR GCSE Physics A (Gateway Science Suite)): Flashcards
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What did Ancient Greeks believe atoms were?
What did Ancient Greeks believe atoms were?
Tiny spheres that cannot be divided
When were electrons discovered?
When were electrons discovered?
1897
Describe the plum-pudding model
Describe the plum-pudding model
Ball of positive charge with negative electrons embedded
What foil was used in alpha-scattering?
What foil was used in alpha-scattering?
Gold foil
What charge do alpha particles have?
What charge do alpha particles have?
Positive
What happened to most alpha particles?
What happened to most alpha particles?
Passed straight through
Atoms are mainly...
Atoms are mainly...
Empty space
Why were some alpha particles deflected?
Why were some alpha particles deflected?
Centre has positive charge, repels them
Why did some alpha particles bounce back?
Why did some alpha particles bounce back?
Nucleus has great mass
What model replaced plum-pudding?
What model replaced plum-pudding?
Nuclear model
What was Bohr's idea about electrons?
What was Bohr's idea about electrons?
Electrons orbit at specific distances
What are electron orbits called?
What are electron orbits called?
Energy levels or shells
Who discovered neutrons?
Who discovered neutrons?
James Chadwick
What is the radius of an atom?
What is the radius of an atom?
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