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WorksheetsChanging Models of the Atom
Total questions: 10
Worksheet time: 11mins
What is the charge of an alpha particle?
+2
-2
0
+1
Which ideas came from the plum pudding model?
The atom cannot be broken down.
The atom contains electrons that orbit a positive nucleus.
The atom is made of electrons contained in a 'soup' of positive charge.
Electrons must be part of the atom since solids rub together to produce static electricity.
Why were alpha particles used in the Rutherford scattering experiment?
They had a small mass
They have a neutral charge
They are about the same size as atoms
They are easy to fire at a target
A vacuum was used in the experiment so that alpha particles would not (a) the air molecules.
Name two parts of apparatus involved in the experiment
Thin copper foil
Fluorescent screen
A bulb
Thin gold foil
What happens to the alpha particles in the Rutherford scattering experiment?
They all go straight through the gold foil
A small number are deflected at large angles
Most go through the gold foil
Nearly all of them deflect backwards from the gold foil
Since there was a very small number deflected backwards, this was evidence that the atom contained a (a) .
How does the Bohr model describe the different coloured flames of burning chemicals?
Electrons are in specific energy levels
Protons and neutrons are in a nucleus
Electrons orbit a nucleus
Electrons are in a 'soup' of positive charge
State two differences between the Bohr model and the plum pudding model
What were the conclusions from the Rutherford scattering experiment?
