From his experiments j. j. Thomson conclude that

J.J. Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. Thomson proposed the plum pudding model of the atom, which had negatively-charged electrons embedded within a positively-charged "soup."

J.J. Thomson could conclude that most of the mass of an atom is concentrated in its center, or the area where most of the parts of an atom such as the nucleus

Explanation:

< > according to newton's third law of motion, forces always act in equal but opposite pairs. another way of saying this is for every action, there is an equal but opposite reaction.< >