A sample of the superconducting oxide is found to contain 14.99% oxygen by mass. (a) As...

A sample of the superconducting oxide is found to contain 14.99% oxygen by mass. (a) Assuming that all other elements are present in the ratios represented by the formula, what is the value of x in the formula? (b) Which of the metallic elements in the compound is (are) most likely to have noninteger average charges? Explain your answer. (c) Which of the metallic ions in the substance is likely to have the largest ionic radius? Which will have the smallest?