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WorksheetsModels of the Atom
Total questions: 12
Worksheet time: 9mins
Who proposed the following model for the atom?
"Atoms are solid spheres. Each element is made of a different type of atom."
Bohr
Chadwick
Dalton
Rutherford
In 1897, J J Thomson discovered the electron. This led him to propose the (a) -pudding model of the atom.
The plum pudding model showed the atom as a ball of (a) charge with electrons stuck inside it.
What was the overall charge of an atom in the plum pudding model?
Positive
Negative
Neutral
It depends on the atom
In 1909, Ernest Rutherford performed his alpha scattering experiment. He fired alpha particles at very thin foil made of (a) .
What was the expected result of the alpha scattering experiment if the plum pudding model was correct?
Most of the alpha particles would pass straight through the foil.
Most of the alpha particles would be completely reflected.
The alpha particles would be absorbed by the gold foil.
The gold foil would produce extra alpha particles.
Most of the alpha particles passed straight through the gold foil. This led Rutherford to propose that...
most of the atom was empty space.
there was a positively charged nucleus at the centre of the atom.
the alpha particles were not aimed properly at the foil.
the plum pudding model was correct.
Some of the alpha particles were reflected backwards by large angles. This led Rutherford to propose that...
most of the atom was empty space.
there was a positively charged nucleus at the centre of the atom.
the alpha particles were not aimed properly at the foil.
the plum pudding model was correct.
Which of these was a problem with Rutherford's atomic model?
The negative electrons would be attracted to the positive nucleus and the atom would collapse.
The negative electrons would be repelled by the positive nucleus and would fly off into space.
The model left the atom with a positive charge.
The model left the atom with a negative charge.
In Bohr's model, the electrons orbit the nucleus in (a) .
In 1932, James Chadwick discovered a new particle in the nucleus called the (a) .
Why were neutrons the last sub-atomic particle to be discovered?
They have a positive charge so interact to quickly with other charges.
They have a negative charge so interact to quickly with other charges.
They have no charge so do not interact with other charges.
