The Atomic Nucleus - Gold Foil Experiment

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

• The model is a indivisible and indestructible sphere

• The model is a sphere in which negatively charged particles - electrons- immersed in a positively charged space of the sphere.

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

• The model is a sphere in which negatively charged particles - electrons - move around the nucleus of an atom in a defined passes, called orbits, like planets around the sun

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 Ernset Rutherford?

• English Science teacher who developed the first Atomic Theory

• English physicist who discovered an electron

• German physicist who discovered a proton

• New Zealand born physicist who established existence of a positively charged nucleus in an atom

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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 electrons

• They wanted to come up with their own Atomic Model

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What is an alpha particle?

• It is a dominant particle in a 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

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

• He expected that most of alpha particles would go through a gold-foil and small number of particles would deflect sightly

• He expected that most of alpha particles would not go through a gold-foil and will stop on one side of a foil.

• He expected that most of alpha particles would ricochet back after hitting a gold-foil

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

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

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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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