An unknown element has two isotopes. Isotope #1 has an atomic mass of 84.91 amu (72.16%) and isotope #2 has an atomic mass of 86.91 amu (27.84%). (a) What is the average atomic mass? Isotope #1: Х Isotope #2: Х (b) What is the element? amu

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?

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What’s the theoretical yield of solid lead