What is the buddy law in science.

List four observations that indicate that a chemical reaction may be taking place

Use the periodic table to determine the electron configuration of dysprosium (dy) and americium (am) in noble-gas notation.

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?