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Simple quantum question

Discussion in 'MCAT: Medical College Admissions Test' started by jammin06, Apr 27, 2004.

  1. jammin06

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    Sup everyone, i'm workin on the EK chemistry book right now, and i just came across the following question:

    Compared to an electron with a principle quantum number of 1, an electron with a principal quantum number of 2 will have:

    lower energy
    higher energy
    negative spin
    positive spin

    I think the answer is higher energy, but the book tells me that it's lower energy. Can someone explain this concept to me? Thanks a ton.
     
  2. duck2005

    duck2005 Member
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    nope. HIGHER energy. the lowest energy = ground state = lowest n. Furthermore, Energy of e- = -R/n^2. R is a constant. higher n = lower (R/n^2) = higher -R/n^2. Don't forget the negative in that equation. Plus, more generally, lower energies have aways been associated with lower n.

    higher n does, though, mean lower ionization energy. energy of an e- in orbit is negative. energy of freed electron (after ionization) = 0. thus, the higher the n, the higher the energy (which means less negative), and the less energy necessary to raise this negative energy to a value of 0.
     
  3. Lion-O

    Lion-O Sight beyond sight.
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    duck2005 nailed it: definitely higher energy.
     
  4. PhatGtDmB

    PhatGtDmB Member
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    w/o a doubt HIGHER energy
     
  5. jammin06

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    woo, so i've found my first error in the EK series....yay for me! maybe this an omen to tell me i wont COMPLETELY bomb the entire mcat :)
     
  6. lihini

    lihini Member
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    I agree HIGHER energy !
     
  7. fun8stuff

    fun8stuff *hiding from patients*
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    correct! .
     
  8. gdk

    gdk Senior Member
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    you might want to check the errata on the ek website. that one might have already been noted, along with some others you haven't found yet
     
  9. jammin06

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    yea, i posted it on their website, but no one has responded. They changed the format of website, so all the old posts are gone i think. It'll pick back up in the summer when everyone else is using the material though.
     
  10. tae1703

    tae1703 Senior Member
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    i would say higher energy, unless i completely wasted my time and money going to my selected university
     
  11. ChemMN

    ChemMN Member
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    Everyone here is absolutely correct. An electron must gain energy in the form of a photon to be promoted to n=2. It doesn't radiate energy in this transition.
     

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