What is true about the vapor pressure of a liquid

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

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?

Correct relationship between molecular formula and empirical formula