Structure of the Atom

What is at the center of every atom?

• An electron
• A compound
• A molecule
• A nucleus

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NGSS.HS-PS1-8

Which two particles make up the nucleus of an atom?

• Protons and Electrons
• Protons and Neutrons
• Molecules and Compounds
• Neutrons and Electrons

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NGSS.HS-PS1-8

In an atom, what is the number of protons equal to?

• The number of electrons.
• The number of neutrons.
• The number of molecules.
• The number of nuclei.

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NGSS.MS-PS1-1

The negatively charged particles of an atom are the ______.

• electrons
• protons
• neutrons
• protons & neutrons

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NGSS.MS-PS1-1

Which element has 31 protons ?

• Gallium 
• Germanium
• Gadolinium
• Polonium

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NGSS.HS-PS1-1

Oxygen’s atomic number is 8. This means that an oxygen atom must have

• 8 electrons
• 8 protons
• 8 neutrons
• a mass number of 8

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NGSS.HS-PS1-1

 What is the mass number of this element?

• 5
• 27
• 32
• 59

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NGSS.MS-PS1-1

Electrons can best be described as having a

• large size, positive charge.

• very small size, positive charge.

• large size, negative charge.

• very small size, negative charge.

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NGSS.HS-PS1-1

Neutrons have almost exactly the same mass as

• electrons.

• positrons.

• protons.

• quarks.

Atoms of different elements have

• the same # of protons.

• the same general properties.

• a different # of protons.

• the same # of electrons.

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NGSS.HS-PS1-1