The atom, its history and atomic structure

Choose the correct description of J. J. Thomson's Model of an Atom.

• The model is an indivisible and indestructible sphere, similar to a billiard ball.

• The model is a sphere in which negatively charged electrons are immersed in a positively charged cloud.

• The model is a sphere in which negatively charged electrons move around the center of an atom creating an electron cloud.

• The model is a sphere in which negatively charged electrons move around the centre of an atom at distinct energy levels.

What is the name of J.J. Thomson's Model of an Atom?

• Jimmy Neutron Model

• Solar System Model

• Plum Pudding Model

• Quantum mechanical Model

Who was Ernest Rutherford?

• English Science teacher who developed the first atomic theory.

• English physicist who discovered the electron.

• German physicist who discovered the proton.

• New Zealand physicist who discovered that atoms were mostly empty space with a dense, positive nucleus.

Why did Ernest Rutherford and his colleagues perform the Gold Foil Experiment?

• They wanted to test and confirm the Plum Pudding model.

• They wanted to test John Dalton's Model.

• They were looking for proof for the existence of electrons.

• They wanted to come up with their own atomic model.

What is an alpha particle?

• It is a dominant particle in the subatomic world

• It is a particle that has 2+ charge

• It is a particle that has 2- charge

• It is a helium atom without a charge

What results did Rutherford expect to see if the Plum Pudding model is correct?

• He predicted that the alpha particles would pass through the gold foil.

• He predicted that the alpha particles would be unable to pass through the solid gold foil.

• He predicted that most of alpha particles would ricochet back after hitting the gold foil.

• He predicted that the alpha particles would be deflected by positive charges in the gold foil.

What results did Rutherford observe in his Gold Foil experiment?

• He observed that all alpha particles went through the gold foil in straight lines.

• He observed that most of the alpha particles stopped and could not go through the gold foil.

• He observed that most of the alpha particles passed straight through the gold foil but that some had deflected off of something.

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

What was a conclusion that Ernest Rutherford made based on his results from the Gold Foil Experiment?

• He concluded that the atom is indivisible.

• He concluded that the atom is mostly empty space with a dense, positive core.

• 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

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Rutherford concluded what about the nucleus of the atom?

• The dense centre of the atom has a positive charge.

• The dense centre of the atom has a negative charge.

• The dense centre of the atom has no charge.

• The atom doesn't have a centre and all atomic particles are distributed evenly like a plum pudding or choc-chip cookie.