Period table review i need help due on tomorrow help I will post the???

Endeleev saw trends in the physical and chemical properties of elements when he organized them by

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?

Define dew point. i am writing this part to be able to ask the question