How many moles are in 3.50 x 1024 atoms of yttrium

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

According to each substances heat of fusion, which of the items below requires more heat to be added per gram of substance to go from solid to liquid? silver sulfur water lead

In the cathode ray tube experiment, j. j. thomson passed an electric current through different gases inside a cathode ray tube in the presence of an electric field. in which two ways did this experiment change scientists’ understanding of the atom?