Rutherford

The alpha particles in Rutherford’s experiments were used to -

• Identify chemical properties

• Bombard sheets of gold

• Identify the melting point

• Determine the molecular mass

What results did Rutherford observe in his Gold-Foil experiment?

• He observed that all alpha particles did go through a gold-foil in straight lines

• He observed that most alpha particles did not go through a gold-foil and stopped on one side of the gold foil.

• He observed that a small number of alpha particles bounced off the gold-foil at very large angles

• He observed that all alpha particles slightly deflected from the straight line when going through a gold-foil

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Choose one of the conclusions that Ernest Rutherford made based on the experimental results of his Gold-Foil experiment

• He concluded that the atom is indivisible

• He concluded that the atom is mostly empty space

• He concluded that the atom has neutrons

• He concluded that the atom is tightly packed with subatomic particles all mixed together

Choose one of the conclusions that Ernest Rutherford made about the mass of the atom, based on the experimental results of his Gold-Foil experiment

• He concluded that almost all mass of the atom is distributed evenly among subatomic particles

• He concluded that almost all mass of the atom is distributed among electrons

• He concluded that almost all mass of the atom is concentrated in a small region, in a center of an atom, that has a positive charge

• He concluded that almost all mass of the atom is concentrated in a small region, in a center of an atom, that has a negative charge

Based on the experimental results of his Gold-Foil experiment, Ernest Rutherford concluded that

• The very dense center of the atom has a positive charge

• The very dense center of the atom has a negative charge

• The very dense center of the atom has no charge

• The atom doesn't have a center and all particles are distributed evenly like in a chocolate chip cookie

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Based on Rutherford's model of the atom, electrons in the atom are located

• inside of the nucleus of the atom

• outside and around the nucleus of the atom

• outside and inside of the nucleus of the atom

Rutherford realized that the atomic nucleus was positively charged because

• it attracted alpha particles.

• it deflected alpha particles.

• it had no effect on alpha particles.

• it produced alpha particles.

In Rutherford atomic model the alpha particles were stroked on

• Aluminium

• Gold

• Silver

• Titanium

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Who came up with this model?

• Dalton

• Thomson

• Rutherford

• Bohr

In the gold foil experiment, most of the positively charged alpha particles passed through the gold foil, but some were deflected or bounced back.  What did we conclude because of this?  

• Atoms are small indivisible spheres

• Atoms are mostly empty space with a small, dense, positive center

• Atoms have negatively charged particles which orbit the nucleus

• Light is a wave, not a particle