Atomic Structure (OCR GCSE Physics A (Gateway Science Suite)): Flashcards
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What particles are in the nucleus?
What particles are in the nucleus?
Protons and neutrons
Relative mass & charge of proton
Relative mass & charge of proton
Mass: 1, Charge: +1
Relative mass & charge of neutron
Relative mass & charge of neutron
Mass: 1, Charge: 0
Relative mass & charge of electron
Relative mass & charge of electron
Mass: 0 (0.0005), Charge: -1
Typical radius of an atom
Typical radius of an atom
metres
How much smaller is nucleus radius than atom?
How much smaller is nucleus radius than atom?
10,000 times smaller
Where is most of atom's mass concentrated?
Where is most of atom's mass concentrated?
In the nucleus
What can change electron arrangements?
What can change electron arrangements?
Interaction with EM radiation
Thomson's plum pudding model description
Thomson's plum pudding model description
Ball of +ve charge with -ve electrons embedded
Rutherford: why did most alpha particles go through?
Rutherford: why did most alpha particles go through?
Atom is mostly empty space
Rutherford: why did some alpha particles bounce back?
Rutherford: why did some alpha particles bounce back?
Mass is concentrated in the centre
Bohr's model: what are energy levels/shells?
Bohr's model: what are energy levels/shells?
Specific distances where electrons orbit nucleus
Who proved the existence of the neutron?
Who proved the existence of the neutron?
James Chadwick
What does atomic number represent?
What does atomic number represent?
Number of protons and electrons
When atom absorbs EM radiation, what happens?
When atom absorbs EM radiation, what happens?
Electron moves from lower to higher energy level