# Simple quantum question

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

1. ### jammin06 7+ Year Member

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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 Member 5+ Year 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 Sight beyond sight. 7+ Year Member

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duck2005 nailed it: definitely higher energy.

4. ### PhatGtDmB Member 7+ Year Member

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w/o a doubt HIGHER energy

5. ### jammin06 7+ Year Member

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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 Member 10+ Year Member

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I agree HIGHER energy !

7. ### fun8stuff *hiding from patients* 15+ Year Member

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correct! .

8. ### gdk Senior Member 10+ Year 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 7+ Year Member

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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 Senior Member 10+ Year Member

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i would say higher energy, unless i completely wasted my time and money going to my selected university

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