Turn on thread page Beta
    • Thread Starter
    Offline

    10
    ReputationRep:
    Can someone please help me I do not understand covalent Bonding can somone please explain what the drawings are for like Hydrogen methane oxygen etc I dont understand it. Thanks
    • Community Assistant
    Offline

    20
    ReputationRep:
    Community Assistant
    Covalent bonding is when electrons are shared between atoms in a compound or molecule, so the two atoms both use the electron (contrasted with ionic where the electron is "donated" and so isn't used by the "donating" atom)
    • Thread Starter
    Offline

    10
    ReputationRep:
    Thanks
    Offline

    7
    ReputationRep:
    Assuming you know how to draw a normal electron configuration diagram of a single atom - a Covalent bond for Hydrogen would be single hydrogen diagram put together so that the electrons in each of the two diagrams are side by side one as a dot, and the other as a cross so that they can be distinguished. The point that the two diagrams are over lapping creating a small overlapping section is where these electrons would go. This covalent bond would form H2.
    The reason why this occurs is because hydrogen has 1 electron on its outermost shell and because this is in the first shell it only needs one more electron to gain a fuller outermost shell so that it is stable because this is what atoms want. This means that it needs one more electron to become full hence one more hydrogen atom will do the job creating H2. Using this concept you should be able to work out what methane (CH4) and Oxygen (O2) would look like.
    Offline

    1
    ReputationRep:
    Covalent bonding - SHARING electrons - between molecules/compounds
    All atoms want a full outer shell , so non-metals covalently bond to do this.

    eg Hydrogen has 1 valance electron - needs 1 more for Noble gas config (Full outer shell)
    so it combines with another hydrogen atom (also with 1 valance electron) to make H2 molecule (two H atoms) -- so shared their electrons
    and the process in a drawing is:



    eg2 Methane CH4 , carbon has 4 valance electrons, can make 4 more bonds/to get F..O..S... so combines with 4 Hydrogen atoms (all with 1 valance electron) and makes each atom have a full outer shell by sharing all electrons, and creates molecule compound Methane (CH4)



    In simple terms visually,


    You can draw covalent bonds either as: dot and cross diagrams (above), or solid line diagrams

    Solid line diagrams eg Methane





    Just remember for solid line diagrams... if there's a double or triple bond between atoms, put the right number of line in between, i.e:
    • Thread Starter
    Offline

    10
    ReputationRep:
    Thanks so much!!
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: October 30, 2016
The home of Results and Clearing

867

people online now

1,567,000

students helped last year

University open days

  1. Sheffield Hallam University
    City Campus Undergraduate
    Tue, 21 Aug '18
  2. Bournemouth University
    Clearing Open Day Undergraduate
    Wed, 22 Aug '18
  3. University of Buckingham
    Postgraduate Open Evening Postgraduate
    Thu, 23 Aug '18
Poll
A-level students - how do you feel about your results?

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

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