What types of elements [metals/nonmetals] are found in each of the compounds? Not a simple answer please

What element breaks down into yttrium-90?

According to the diagram; a) identify the anode of the cell and write the half-reaction that occurs there b) write the overall equation for the reaction that occurs as the cell operates c) calculate the value of the standard cell potential ,e cell. d)write the shorthand notation of the cell above e)indicate the flow of the electrons on the diagram

Fill in the coefficients that will balance the following reaction: a0cr2(so4)3 + a1agno3