Posted by ~christina~ on Saturday, December 8, 2007 at 7:50pm.
I think they mean the nuclear spin here.
But even if it is the nuclear spin I don't understand how the protons and neutrons #'s are odd when they are clearly even.
Figuring the spin of an electron is really quite simple. In your notes, I believe you're confusing finding the number of neutrons with the spin.
The spin is either +1/2 or -1/2. You can think of this as clockwise and counterclockwise.
The periodic table is broken up into four sections. The two groups on the left, the ones in the middle, the six groups on the right, and the ones below.
For any given section, the elements in the left half have a spin of +1/2. Those in the right half have a spin of -1/2.
For example, in the S block (the two groups on the left)... H, Li, Na, K, Rb, Cs, and Fr all have a spin of +1/2. On the other hand, He, Be, Mg, Ca, Sr, Ba, and Ra all have a spin of -1/2.
You can apply this to the other sections, too... the Boron group, the Carbon group, and the Nitrogen group all have a spin of +1/2 because they're on the left. The Oxygen group, the halogens (Fluorine group), and the noble gases (Neon group) all have a spin of -1/2.
Actually I'm doing organic chemistry and according to a ppt slide C 12 has no spin and O 16 has none either.
I'm basically looking at whether or not they will have a reading in NMR.
The reason the oxygen has a spin in this case is because it's a isotope of O 16 and in this case is O 17.
Can anyone who knows about nuclear spin help me out with this please.
Oh, sorry about that. :)
The spins of the protons neutrons will pair up antiparallel, so, they all cancel out unless there is an "odd one out". If you have an odd number of neutrons + protons, then the spin is
hbar/2, otherwise it is zero.
Okay then thanks Count Iblis
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