Chemical Bonds Review

Where are valence electrons located?

• In the inner-most shell of an atom.
• In the outer-most shell of an atom.
• Between the inner and outer shells of an atom.
• Inside the nucleus of an atom.

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How many valence electrons do most atoms need to have a complete outer shell and be happy?

• 1
• 8
• 10
• 5

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How do ions form?

• Atoms gain or lose electrons to fill or empty the valence shell.

• Atoms share electrons with each other.

• Atoms get rid of all of their electrons.

• Atoms gain or lose neutrons to change their atomic mass.

If an element gives away an electron, what type of charge will it have?

• Positive.

• Negative.

• Neutral.

If an element gains an electron, what type of charge will it have

• Positive.

• Negative.

• Neutral.

Why does an ion have a charge?

• There are different numbers of protons and neutrons.
• There are different numbers of neutrons and electrons.
• There are different numbers of protons and electrons.
• There are different numbers for atomic mass and atomic number.

How do covalent bonds form?

• Atoms share electrons to fill their valence shell.
• Atoms gain or lose electrons to fill their valence shell.
• Atoms donate electrons to a "sea" of electrons.

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NGSS.HS-PS1-1

Number of C's in 2Na₂CO₃

• 1
• 2
• 3
• 5

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How many Elements are in the compound C₂H₈O ?

• 2
• 1
• 3
• 0

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How many total atoms are in the compound C₂H₈O ?

• 11
• 2
• 8
• 1

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