Atomic Theory Unit Exam

Which subatomic particle is found in the nucleus of all isotopes of hydrogen?

• proton

• positron

• neutron

• electron

• cannot be determined

What are the characteristics of a neutron?

• It has no charge and no mass.

• It has no charge and a mass of 1 amu.

• It has a charge of +1 and no mass.

• It has a charge of +l and a mass of 1 amu.

• cannot be determined

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NGSS.HS-PS1-8

What is the atomic number of this atom?

• 4

• 5

• 8

• 9

• cannot be determined

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NGSS.HS-PS1-1

How many electrons does a neutral atom of Oxygen have?

• 8

• 10

• 16

• 18

• cannot be determined

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NGSS.HS-PS1-1

Which is a finding attributed to Rutherford's Gold Foil Experiment?

• atoms are indivisible and have a dense positive nucleus.

• atoms are divisible and have multiple layers of electrons scattered uniformly about the atom.

• atoms are like plum pudding with positive and negative charges uniformly scattered throughout the atom.

• atoms are mostly empty space with a dense positive nucleus.

• conclusions were unable to be determined

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NGSS.HS-PS1-8

According to the Rutherford model, what is the charged subatomic particle that is located in the nucleus?

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NGSS.HS-PS1-8

Which isotope contains the greatest number of neutrons?

• Cl-37

• K-39

• Ar-40

• Ca-41

• cannot be determined

Determine the total number of neutrons in an atom of Si-29.

Which total mass is the smallest?

• the mass of 2 electrons

• the mass of 2 neutrons

• the mass of 1 electron plus the mass of 1 proton

• the mass of 1 neutron plus the mass of 1 electron

• cannot be determined

Explain, in terms of protons and neutrons, why I-127 and I-131 are different isotopes of iodine.

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NGSS.HS-PS1-4

NGSS.HS-PS1-8