Asked by Shahab Mirza

Among the following electrons, which has highest energy?

a. n = 3, l = 2, m = 0, s = + 1/2
b. n = 4, l = 0. m= 0 , s = - 1/s

answer is A.

but i want to know that how to get this answer help please?
Answered by bobpursley
Memory
1s
2s 2p6
3s2 3p6 4s2 3d10

So in your example, the answer b has a 4s electron
and answer a has a 3d electron (l=2).

See this: http://www.edu.pe.ca/kish/grassroots/chem/Level.gif

and this more complicated discussion:
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CCAQFjAA&url=http%3A%2F%2Fwww.angelo.edu%2Ffaculty%2Fkboudrea%2Fgeneral%2Fquantum_numbers%2FQuantum_Numbers.doc&ei=m7AuVJKBDanE8AHO5ICoDw&usg=AFQjCNG5qgvCn3rzQ4uwdlJkiAMpth20Aw&sig2=bfbamJ0vzDn9oIjzjpV2Uw&bvm=bv.76802529,d.b2U&cad=rja
Answered by Shahab Mirza
@bobpursley . THanks , but tell me , what will happen if we will choose answer which has +1/2 . will this technique work for quick solution help?
Answered by bobpursley
spin 1/2, and -1/2 are same energy state. it is the orbital levels that determine energy state.
Answered by bobpursley
If you are studying for the MCAT, you need a basic review of quantum states in atoms.
Answered by Shahab Mirza
@bobpursley , yeah i am preparing for mcat and only 10 days are left, i have dozens of books but i am still confused in chemistry , specially organic chemistry and physical chemistry , time is also short , any tip?
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