Posted by John on Thursday, October 21, 2010 at 10:37pm.
It is Cr and the reason is that it has unpaired electrons. The electron configuration for the neutral element is
1s2 2s2 2p6 3s2 2p6 3d5 4s1 and when you mak the 3+ ion (as in CrCl3), you take off the last three electrons to give you
[Ar]3d3. Remember the d orbital has five lobes
_ _ _ _ _
x x x
The x stands for an electrons. In fact, almost any way you slice it, Cr has unpaired electrons for almost everything.
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