The formula for terbium phosphate is TbPO4. The formula for terbium sulfate is... How do I figure out how many of each element to use?
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TbPO4 is made up the terbium ion and the phosphate ion.
the phosphate ion is a common polyatomic ion with a charge of -3, so in order to balance the charges (and have an neutral compound) the terbium ion has to be +3.
What charge is the polyatomic sulfate ion?
Once you know that (you can look it up in your book or online) you can figure out how many terbium +3 ions you need to balance the charges (make the charge zero).
Sulfate, SO4 has a -2 charge, so Tb would have to be 2+
No, to balance it you would have to switch the charges, Soo Tb2 (SO4)3