Atomic Structure

A subatomic particle that has a negative charge is called a(n)

• proton

• electron

• neutron

• molecule

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NGSS.MS-PS2-3

How many electrons does an element have with a mass number of 36?

• 36

• 18

• 72

• 3

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NGSS.MS-PS1-1

Which of the following particles has the least mass?

• proton

• electron

• neutron

• orbit

Democritus thought that matter was made of tiny particles

• of earth, air, fire, and water.

• that could not be divided

• that could be divided

• that were all round and smooth

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NGSS.MS-PS1-1

An atom’s mass number equals the number of

• protons plus the number of electrons

• protons plus the number of protons

• Protons plus the number of neutrons

• neutrons

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NGSS.MS-PS1-1

What is an atom’s nucleus made of?

• protons and neutrons

• protons

• protons and electrons

• electrons

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NGSS.MS-PS1-1

Who provided evidence for the existence of a electron in an atom?

• Rutherford

• Thomson

• Dalton

• Bohr

Rutherford’s gold foil experiment provided evidence for

which of the following statements?

• Negative and positive charges are spread evenly

  throughout an atom.

• Alpha particles have a positive charge

• There is a dense, positively charged mass in the center of

  an atom

• Gold is not as dense as previously thought.

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NGSS.MS-PS1-1

Which of the following statements is not true?

• Protons have a positive charge.

• A nucleus has a positive charge

• Neutrons have no charge

• Neutrons have a negative charge.

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NGSS.MS-PS1-1

Chlorine’s atomic number is17. This means that an oxygen atom has

• 35 neutrons in its nucleus

• a total of 17 protons and neutrons

• 17 protons in its nucleus

• a total of 17 neutrons and electrons

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NGSS.MS-PS1-1