I'm Democritus, the pupil of Leucippus and maybe everything is made of particles. I should call these Atomos. (Meaning indivisible)
Hi, I'm John Dalton! I tried to advance the Atomic Theory that Democritus made. I have been measuring the masses of different elements, and if the elements combine, they have to combine in fixed proportions.
I am Niels Bohr, a student of Rutherford I founded the Modern Atomic Theory. The Bohr Model shows that an atom is broken down into a nucleus and electron shells. The nucleus contains protons and neutrons while the electron shells contain electrons.