Hey there! Sign in to join this conversationNew here? Join for free

Confusion over the Lewis structure of the Nitrate ion,NO3- Watch

    • Thread Starter
    Offline

    0
    ReputationRep:
    Why are some Lewis structures of NO3- are A() and some are B(). What is the difference? Shouldn't it be B as N atom forms a dative bond with one of the O atoms? Thank you
    Attached Images
      
    • Community Assistant
    • Study Helper
    Offline

    14
    ReputationRep:
    (Original post by bryan966)
    Why are some Lewis structures of NO3- are A() and some are B(). What is the difference? Shouldn't it be B as N atom forms a dative bond with one of the O atoms? Thank you
    B is not a Lewis structure as it does not show all of the electron pairs.

    B is one resonance form of the three possible electron arrangements. It is an approximation based on the older ideas of bonding.

    In reality there is no difference between the nitrogen oxygen bonds. A more complete picture would show the three N-O bonds 120 degrees apart and equal in length (bond order = 1.33).
    Offline

    14
    ReputationRep:
    2nd structure shows 1 resonance structure of the nitrate ion, of which there are 3. The large bracketed version is the resultant delocalised charge around the whole molecule, think of it as each oxygen atom having -1/3e charge (although that is not reality)
    • Thread Starter
    Offline

    0
    ReputationRep:
    Ahhh, I see
    So, when we're asked to draw the Lewis structure for this specific ion. Should I include a dative bond arrow in it? Thanks a bunch.
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    What newspaper do you read/prefer?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.