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lB and llB = groups 11 & 12. Both are calssified as transition metals. They have different oxidation numbers ranging from + or - 1, 2, 3, or 4. This obviously effects the way they bond with other elements. Generally speaking, if there is more than one oxidation number, unless you are told differently (like use Fe (lll)) you would use the lowest oxidation number.

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Wiki User

11y ago
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Anonymous

Lvl 1
3y ago
This answer isn't helpful.  WHY are IB and IIB AFTER IIIB, IVB, VB, VIB, VIIB, and VIIIB?  Why wasnt IIIB just named IB so they would go in order?  There must be a reason?
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Anonymous

Lvl 1
3y ago
I did a bit more reading.  It seems that Group IIIB, which follows Group IIA, gets its "III" because it generally oxidizes to a +3.  Similarly, group IVB regularly oxidizes to +4 (among other oxidation levels), this trend goes on as the numbers go up.  
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Anonymous

Lvl 1
3y ago
Each element in order has one more electron than the prior one.  So, after dropping an element in IIA, the next element in the row was the element with one more proton/electron.  Because this tended to ionize to +3, it was called IIIB.
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Anonymous

Lvl 1
3y ago
It couldnt be IIIA (that was already taken).  IVB had a +4 oxidation.  But as you added elements, an odd thing happened.  Eventually oxidation numbers dropped again, even though there were more protons.  So, we go BACK to IB and then IIB.
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Anonymous

Lvl 1
3y ago
.... as we continue to add elements!

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