What is the empirical formula of a compound that contains 32.79 % Na, 13.02 % Al, and 54.19 % F?

Explain which group an element with the electron configuration 1s2 2s2 2p6 3s2 3p6 3d1 4s2 belongs to.

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?

What does the mass of 0.7891 mol of ferric oxide (fe2o3)