Ions, Electron Dot, Valence Electrons

What is a valence electron?

• an electron that is found in the outermost shell of an atom. 
• an electron found in the innermost shell of an atom.
• an electron found in the middle shell.

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NGSS.HS-PS1-1

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This is a Bohr Diagram of Aluminum. How many valence electrons does Aluminum have?

• 3

• 4

• 5

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NGSS.HS-PS1-1

How many valence electrons does Lithium (Li) have?

• 8

• 1

• 5

• 2

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NGSS.HS-PS1-1

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How many valence electrons does Bromine (Br) have?

• 5

• 6

• 7

• 8

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of these is correct?

• 
• 
• 

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NGSS.HS-PS1-1

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This could be the dot diagram of 

• Ne
• Si
• Al
• Be

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NGSS.HS-PS1-1

How many valence electrons?

• 2

• 4

• 6

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

Anions ____ electrons, becoming _____ charged.

• Gain; positively (+)

• Gain; negatively (-)

• Lose; positively (+)

• Lose; negatively (-)

The positive ions tend to _____________ electrons.

• Share

• Lose

• Gain

• Neutral

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

If an element gains one electrons, what charge will it have as an ion?

• +1

• -1

• Zero

• -2