8th Grade Unit 1 Review

What is the electrical charge of the nucleus of an atom that has 11 protons, 12 neutrons, and 11 electrons?

• -11

• +12

• -12

• +11

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8.5A

An atom consists of 11 electrons, 12 neutrons, and a number of protons. Which information will be most helpful in determining the charge of the atom's nucleus?

• Mass number

• Conductivity

• Physical properties

• Chemical reactivity

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8.5A

Most of the volume (size) of an atom is occupied by —

• protons

• empty space

• neutrons

• the nucleus

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8.5A

Which of the statements above correctly represents the mass of subatomic particles?

• 1, 6, 9

• 2, 6, 8

• 3, 4, 7, 9

• 4, 5, 6, 8

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8.5A

Which subatomic particle(s) are located within the nucleus of an atom?

• Electrons

• Protons

• Neutrons and electrons

• Neutrons and protons

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8.5A

Which subatomic particle(s) surround(s) the nucleus of an atom?

• Electrons

• Neutrons

• Protons and electrons

• Neutrons and electrons

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8.5A

Which of the following correctly represents the electrical charges of the subatomic particles in the above graphic?

• I - negative charge, II – positive charge, III – no charge

• I - positive charge, II – negative charge, III – no charge

• I - no charge, II – positive charge, III – negative charge

• I - no charge, II – negative charge, III – positive charge

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8.5A

Which of the following is a limitation of the above graphic?

• The neutrons are located in the nucleus of the atom.

• The protons are located in the nucleus of the atom.

• The electrons are in the orbital surrounding the nucleus.

• The electrons are the same size as the protons and neutrons.

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8.5A

Observe the atom above. What subatomic particles are found in the nucleus of the atom and how does that contribute to the overall charge of the nucleus?

• Neutrons and protons only with an overall negative charge

• Neutrons and protons only with an overall positive charge

• Neutrons and electrons only with an overall negative charge

• Protons and electrons only with an overall neutral charge

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8.5A

Observe the model of the atom above. In 1913, Niels Bohr proposed a model that illustrates the locations of subatomic particles. While models of the atom have changed with new understanding, the location of the subatomic particles in current models remains similar to Bohr’s model.

Which of the following best describes the locations of the three subatomic particles in atoms?

• Protons and neutrons are located in the cloud around the nucleus, and electrons are located in the nucleus of the atom.

• Protons and electrons are located in the cloud around the nucleus, and neutrons are located in the nucleus of the atom.

• Protons and neutrons are located in the nucleus of the atom, and electrons are located in the cloud around the nucleus.

• Electrons are located in the nucleus of the atom, and protons and neutrons are located in the cloud around the nucleus.

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8.5A