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kr vs neon

Discussion in 'DAT Discussions' started by pistolpete007, Jun 12, 2008.

  1. pistolpete007

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    so krypton has higher melting point bc its larger....does it have a lower bp tho.

    also which has the 2nd largest ionization energy
    Mg
    Ca
    Rb
    Cs

    finally halogens have higher IE than noble gases right?
     
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  3. Danny289

    Danny289 Member

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    Kr has higher melting point because London force is higher.
    for second question Rb because it belongs the first group and has smaler radius compare to Cs( Cs is in first group too) and for second electron you must go another shield.
    for third one remeber you must compare in group or row together and can not generalize halogen and Nobel gas, for example you can ask in third row between Ar and Cl which one has higher IE? answer is Ar has higher IE.
    :thumbup: good luck
     
  4. DCRedskinsRule

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    do you mean 2nd largest IE or the largest 2nd IE? b/c those are COMPLETELY different questions...
     
  5. lphiewok

    lphiewok ACFAS Member

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    for your question, i donno if you're mixing up but do not mix up MP with Freezing point. Bigger atom with more intramolecular forces, it will probably have higher mp and bp (they are both usually related except like cis-trans etc.)

    also yes 2nd largest IE and largest 2nd IE are totally different. I am pretty sure you're asking about largest 2nd IE, since 2nd largest atom would probably not make much sense.
    for most of questions asking for 2nd IE, usually answer will be group IA since 1st IE will put it into noble gas configuration of one lower shell and then 2nd IE will be HIGH since they are very stable noble gases, and it'll be hard to take that electron out of that configuration.
    and also 2nd IE is always greater than 1st IE
     
  6. Farboodi

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    What does melting point mean for a "noble gas"? I don't understand when it says the melting point of Kr is higher than Ne!
     
  7. FeralisExtremum

    FeralisExtremum SDN Gold Donor
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    Melting point of Kr is higher because it is larger, and therefore its larger surface area benefits most from London Dispersion forces vs the other atoms.

    Remember, these are noble gases that are satisfied with their filled octet so they are not really chemically bonded to each other, they're floating around as atoms.
     
    #6 FeralisExtremum, Jan 28, 2013
    Last edited: Jan 28, 2013

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