. . "Mz xHyPnO3n+1 wherein M is a metal, ???x??? is a number ranging from 1 to 12, and ???y??? is a number ranging from 1 to 12, ???n??? is a number in the range of 1 to 10, ???z??? is a number in the range of 1 to 5, and the sum of xz+y is equal to n+2." . .