An electrically neutral atom consists of 15 neutrons, 13 electrons, and a number of protons. What is its mass number?

A.13

B.15

C.28

D.30

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 statement goes against the kinetic theory of gases

What is the name of the enzyme that forms at the start of transcription?