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    Any chemistry experts/fellow student available to help damsel in distress?

    To do with ionisation energy and periodicity

    Thank you!!!

    12 Comments

    Sure thing! Hit me with it! I'll try my best! :thumbsup:

    Original Poster

    hdizzle;6608828

    Sure thing! Hit me with it! I'll try my best! :thumbsup:



    Found it now, you want it still?

    Mrs.Z;6608840

    Found it now, you want it still?



    Oh I thought you needed help, I thought I may be able to, did my Chem A-level last year

    Original Poster

    hdizzle;6608845

    Oh I thought you needed help, I thought I may be able to, did my Chem … Oh I thought you needed help, I thought I may be able to, did my Chem A-level last year



    I did when I posted OP, but carried on searching :-D

    http://www.iun.edu/~cpanhd/C101webnotes/modern-atomic-theory/images/ionization-energy.jpg
    Needed to explain the slight drops in ionisation energy between 'Be' and 'B' - and 'Mg' and 'Al' :thumbsup:

    Ahh coolio. Well i'm glad you found it! Just a tip...if you have any chemistry issues you should try this site:

    ]http//ww…uk/

    It's so so useful, it got me through A-level Chem!

    So I'm guessing your doing Module one? Good luck !

    Original Poster

    hdizzle;6608874

    Ahh coolio. Well i'm glad you found it! Just a tip...if you have any … Ahh coolio. Well i'm glad you found it! Just a tip...if you have any chemistry issues you should try this site:]http://www.chemguide.co.uk/It's so so useful, it got me through A-level Chem!So I'm guessing your doing Module one? Good luck !



    Ooh, thank you!
    I am actually doing BTEC Applied Science as I unfortunately couldn't work the A-Level timetable around the kids school times :oops:
    Maybe you can help me after all :-D
    I can explain the decrease in energy between groups 2&3 but not the slight decrease between groups 5&6 :thinking:

    Original Poster

    For Mg I have 1S2 2S2 2P6 3S2
    For Al I have 1S2 2S2 2P6 3S2 3P1
    so that explains the lower ionization energy for Al

    but with groups 5 & 6 I have for example

    P (phosphorous) - 1S2 2S2 2P6 3S2 3P3
    S (Sulphur) - 1S2 2S2 2P6 3S2 3P4

    :?

    Maybe I should go to bed :giggle:

    Ah, sorry got it - it's because of the pairs :oops:

    ok i know this, let me just get some images on here so i can explain it

    Original Poster

    hdizzle;6608988

    ok i know this, let me just get some images on here so i can explain it



    I have got it, trying to put it down in words without makung a separate essay, so images would be great :-D

    Ok, phosphorous has 3 electrons in 3p, which are all unpaired (singly occupied orbitals), whereas Sulphur has 4 electrons making one of them orbitals paired:
    http://image.tutorvista.com/content/atomic-structure/electronic-configuration-sodium-aluminium-phosphorous-sulphur.gif

    There is some repulsion with the paired electrons in sulphur, which lessens their attraction to the nucleus. Therefore its easier to remove one of these paired electrons from sulphur than an unpaired 3p electron from phosphorus. Hence the decrease in energy.

    Hope that helps :thumbsup:

    Original Poster

    hdizzle;6609030

    Ok, phosphorous has 3 electrons in 3p, which are all unpaired (singly … Ok, phosphorous has 3 electrons in 3p, which are all unpaired (singly occupied orbitals), whereas Sulphur has 4 electrons making one of them orbitals paired:There is some repulsion with the paired electrons in sulphur, which lessens their attraction to the nucleus. Therefore its easier to remove one of these paired electrons from sulphur than an unpaired 3p electron from phosphorus. Hence the decrease in energy.Hope that helps :thumbsup:



    Wow, it sure does, I was contemplating drawing that box myself on the computer so you just saved me about 3 hours work :giggle:

    Mrs.Z;6609080

    Wow, it sure does, I was contemplating drawing that box myself on the … Wow, it sure does, I was contemplating drawing that box myself on the computer so you just saved me about 3 hours work :giggle:



    coolio, hope my explanation was clear, its been a long time since i did this stuff!
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