Atom Nucleus

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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NGSS.HS-PS1-8

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

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

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

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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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NGSS.HS-PS1-8