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Thread: Electron configuration and ion formation

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    Feeling ambitious! Aysce's Avatar
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    Electron configuration and ion formation

    Question:

    Show (in terms of electron configurations of the atoms involved and the ions formed) how the following pairs of elements form ionic compounds. Deduce the formulae of the compounds formed:

    c. Sodium and oxygen

    So this is my working:

    Na (2,8,1) O(2,6)

    I can't see what will happen though. If Na transfers 1 electron, it won't share the electron configuration of a noble gas ie (2,8).

    I doubt Oxygen can transfer 6 electrons to sodium and even if it is possible, Na wll only be (2,8,7) not (2,8,8).

    So can it be deduced that these two elements cannot form ionic compounds? Thanks.
    Bachelor of Medical Science I (USYD) 2013-2016



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    Cadet deswa's Avatar
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    Re: Electron configuration and ion formation

    You are assuming that there has to be a one to one ratio of oxygen to sodium. For simplicity, and I recommend you do this, just look at the valency of the element (essentially number of electrons in the outer shell). Sodium has one, so it has a valency of +1. Oxygen needs two more to complete its outer shell, so its valency is -2. Now valencies need to sum to zero for a compound so simple maths shows that two sodiums and one oxygen will lead to a valency of zero. Thus the ionic compound is Na2O-> sodium oxide

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    Re: Electron configuration and ion formation

    Quote Originally Posted by deswa View Post
    You are assuming that there has to be a one to one ratio of oxygen to sodium. For simplicity, and I recommend you do this, just look at the valency of the element (essentially number of electrons in the outer shell). Sodium has one, so it has a valency of +1. Oxygen needs two more to complete its outer shell, so its valency is -2. Now valencies need to sum to zero for a compound so simple maths shows that two sodiums and one oxygen will lead to a valency of zero. Thus the ionic compound is Na2O-> sodium oxide
    Thanks a lot deswa

    Great tip too!
    Bachelor of Medical Science I (USYD) 2013-2016



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    Re: Electron configuration and ion formation

    Didn't want to make another thread but I got stuck with this question:



    I'm stuck between M and R, reason why I even considered M and R is because I'm assuming that the noble gases are on the far right, so they must gain electrons --> Leading to electronegativity. But other than that, I'm really not sure what else to consider. Perhaps a clue if possible?
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    Retired Nov '14 someth1ng's Avatar
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    Re: Electron configuration and ion formation

    Quote Originally Posted by Aysce View Post
    Didn't want to make another thread but I got stuck with this question:



    I'm stuck between M and R, reason why I even considered M and R is because I'm assuming that the noble gases are on the far right, so they must gain electrons --> Leading to electronegativity. But other than that, I'm really not sure what else to consider. Perhaps a clue if possible?
    M.
    Penrith High School '12

    Bachelor of Science (Advanced) (Chemistry, Environmental Studies)
    University of Sydney

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    Re: Electron configuration and ion formation

    Can you explain why you'd pick M over R though?
    Bachelor of Medical Science I (USYD) 2013-2016



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    Senior Member Amogh's Avatar
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    Re: Electron configuration and ion formation

    Quote Originally Posted by Aysce View Post
    Can you explain why you'd pick M over R though?
    As you move down the rows, the number of electron shells increase.

    So, M has a lower number of shells than R. The nucleus (and thus protons) are closer to the shells and the electrostatic attraction level in M is greater (i.e. more electronegative)

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    Re: Electron configuration and ion formation

    Quote Originally Posted by Amogh View Post
    As you move down the rows, the number of electron shells increase.

    So, M has a lower number of shells than R. The nucleus (and thus protons) are closer to the shells and the electrostatic attraction level in M is greater (i.e. more electronegative)
    Ah okay I understand.

    Thanks for your help And to someth1ng as well.
    Bachelor of Medical Science I (USYD) 2013-2016



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    Re: Electron configuration and ion formation

    Out of curiosity, what textbook(s) are you using to learn this stuff?

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    Re: Electron configuration and ion formation

    Quote Originally Posted by deswa View Post
    Out of curiosity, what textbook(s) are you using to learn this stuff?
    Conquering chemistry - Heard good things about this book but it's my only source atm. Any recommendations?
    Bachelor of Medical Science I (USYD) 2013-2016



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    Re: Electron configuration and ion formation

    Quote Originally Posted by Aysce View Post
    Conquering chemistry - Heard good things about this book but it's my only source atm. Any recommendations?
    That's a good textbook. Chemistry Contexts is also good.
    Penrith High School '12

    Bachelor of Science (Advanced) (Chemistry, Environmental Studies)
    University of Sydney

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