A metal forms two oxides X and Y when contains 28.9% and 21.0% oxygen respectively. a) calculate the ratio by mass of metal in the two oxides
b) what chemical law does it illustrate​

Which statement best summarizes the importance of ernest rutherford’s gold foil experiment? it proved that all of john dalton’s postulates were true. it verified j. j. thomson’s work on the atomic structure. it showed that an electron circles a nucleus in a fixed-energy orbit. it showed that a nucleus occupies a small part of the whole atom.