How does an atom become an ion?

• Gain/Lose neutrons
• Gain/Lose Electrons
• Gain/Lose Protons
• Gain/Lose Atomic Mass

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NGSS.HS-PS1-1

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How many valence electrons does Potassium have?

• 4
• 8
• 2
• 1

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NGSS.HS-PS1-1

What does Sodium do to become an ion?

• It doesn't. 
• Gain 1 electron
• Gain 7 electrons
• Lose 1 electron

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NGSS.HS-PS1-1

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Ions are: 

• atoms with a positive or negative charge
• atoms with no charge
• atoms with ONLY a positive charge
• atoms with ONLY a negative charge

When an atom loses a valence electron, it becomes a(n) _____________ ion.

• positive
• negative
• neutral
• polyatomic

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NGSS.HS-PS1-1

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Negative ions form when atoms _________ valence electrons.

• lose
• gain
• share
• excite

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

When an atom loses a valence electron, it becomes a(n) _____________ ion.

• positive
• negative
• neutral
• polyatomic

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

What happens when an atom gains an electron?

• It becomes Negatively Charged
• It remains neutral because the proton also leaves.
• It becomes Positively Charged
• It stays the same.

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NGSS.HS-PS1-2

In general, atoms with less than 4 electrons tend to __________ electrons while those with more than 4 electrons tend to __________ electrons when they form ions.

• gain; lose
• lose; gain
• lose; lose
• gain; gain

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

When Magnesium (Mg) loses its two valence electrons, it becomes . . .

• a anion

• a cation

• unstable

• an isotope

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NGSS.HS-PS1-1

NGSS.HS-PS1-2