Scientists researched electrons and came to know about electrons after the battery was developed as we can see in the JJ Thomson's model that he used the cathode and anode. My question is that that if the scientists have known already that there are positive and negative charge that they have made the battery they should have known about electrons.
I am confused in this. Research tells that electrons were first discovered by JJ Thomson and that there are negative charges in atoms. My question is that that, without knowing about electrons how were the ideas of cathode and anode developed.