Lewis Structures

For carbonate ions, how many resonance structures can be drawn ?

• 2
• 3
• 4
• 5

What is the formal charge on the oxygen atom at the top of this Lewis dot structure?

• 0

• -1

• +1

• -3

What is the formal charge on the phosphorus atom in this Lewis dot structure?

• 0

• -1

• +1

• -3

What is the formal charge on the oxygen atom at the top of this Lewis dot structure?

• 0

• +1

• -1

• -2

What is the picture showing?

• All of the resonance structures for carbonate.

• The formal charge on each atom in carbonate.

• The electronegativity for carbonate.

• The ionization energy for carbonate.

What is the best definition of valence electrons?

• The outermost electron NOT involved in chemical reactions

• The innermost electrons involved in chemical reactions

• The outermost electrons involved in chemical reactions.

• The innermost electrons NOT involved in chemical reactions

What is the name for when more than one valid Lewis structure can be drawn for a molecule?

• coordinate covalent bond

• resonance

• endothermic

• structural formula

Do you think Nitrogen at the central already achieved an octet?

• Yes

• No

What type of octet has SF₆ got?

• Achieved octet.

• Incomplete octet.

• Expanded octet.

• Odd number electrons.

Draw the Lewis structure for BH₃ on your own. Then compare your drawing to the answer choices, and select the correct drawing for BH₃.

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