Question

How was atom discovered?
who discovered atom?
when was atom discovered?

Answer 1

A). J. J. Thompson discovered the electron in 1897,(cathode ray experiment) which led him to posit a “plum pudding” model (a.k.a. the “raisin pudding” model) for the atom.
thus he came to know that eectrons are part of atoms



B) J.J Thomson discovered atom

c)
Atom was discovered at 1897