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    Good luck everyone!
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    (Original post by tbh12)
    Can someone please explain to me the answer to question 5g?

    http://filestore.aqa.org.uk/subjects...1-QP-JUN13.PDF

    Nb: the answer is 'Second' but I can't work out why.
    Tl has its outer electrons as 6s^2, 5d^10, 6p^1, so removing the first electron removed the 6p1 electron, then the second removes it from the 6s2, as the 6s orbital is the higher energy orbital out of 6s and 5d.

    That's why when you write electron configurations, you would write 4s2 before 3d10, the s orbital gets filled before the d orbital, and is also first to have its electrons removed.

    So Tl has the configuration 6s1, 5d10 when is has had 2 electrons removed

    Hope this helps and it's not too confusing!
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    Is there another way to work this out? It's just that in the specification I don't think we have to know about f orbitals but I think that in order to work out the electron configuration of TI you need to know about f orbitals...or am I missing something?

    Cheers
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    (Original post by tbh12)
    Is there another way to work this out? It's just that in the specification I don't think we have to know about f orbitals but I think that in order to work out the electron configuration of TI you need to know about f orbitals...or am I missing something?

    Cheers
    It's in the textbook! Look up Aufbau's principle - that should help 😄
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    (Original post by tbh12)
    Is there another way to work this out? It's just that in the specification I don't think we have to know about f orbitals but I think that in order to work out the electron configuration of TI you need to know about f orbitals...or am I missing something?

    Cheers
    Not in great detail, no, but I'm sure that you should be aware that f orbitals can hold up to 14 electrons in their outer shell, in the same way that you know s holds 2 electrons, p holds 6 electrons and d holds 10 electrons.

    So, once you have that in mind it should be easy to work out:

     [Xe] 5d^1^0 6s^1  =65

    Thallium has 81 electrons.

    81 - 65 = 16

    16 - 14 (from your knowledge of f orbitals) = 2.

    If there are 2 electrons left then that means two electrons were removed from the outer shell which means that it's the second ionisation energy.

    At least, that's how I'd do it anyway. It's only one mark so you already know that it can't require that much effort.
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    Hopefully this won't be too bad 🙏
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    Can someone give me a rundown of the shapes of molecules and bond angles?
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    (Original post by TheLifelessRobot)
    Can someone give me a rundown of the shapes of molecules and bond angles?
    2 bonded pairs - linear - 180
    3 bonded pairs - trigonal planar - 120
    4 bonded pairs - tetrahedral - 109.5
    3 bonded paris 1 lone pair - trigonal pyramidal - 107
    2 bonds, 2 lone pairs - bent/non linear - 104.5
    5 bonded pairs - trigonal bipyramidal - 90, 120
    6 bonded pairs - octrahedral - 90
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    https://d0a8df085b12e31aa074535f16f7...0Chemistry.pdf
    to get an answer for 3a)iii you multiply your answer in 3a)ii by 10. can anyone explain this pls. i would really appreciate any help
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    Good luck everyone!!!!
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    Good luck
    I kind of get the thallium question now
    How many electrons do f orbitals carry? 14?


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    Good luck ohmyg. - Hope it goes well for you all.:woo:
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    If this paper isnt pi** easy i swear to god
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    (Original post by Bloom77)
    Good luck
    I kind of get the thallium question now
    How many electrons do f orbitals carry? 14?


    Posted from TSR Mobile
    Yeah remember F for fourteen
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    Exam should be nice
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    Was good I think. Does anyone remember any of their values at all?!


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    absolutely awful 🙃
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    (Original post by Danny786)
    Was good I think. Does anyone remember any of their values at all?!


    Posted from TSR Mobile
    I remember getting 1,065,700 or something like that for one question...
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    (Original post by sean.17)
    I remember getting 1,065,700 or something like that for one question...
    The percentage yield one?


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    Went okay, though I got like 1000kg for the third off last question hahah oops
 
 
 
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