How do I write a timeline of the atom progression overview?

Question

A drawing of the timeline would be much appreiated

Answer 1

"atom progression"? By that I guess you mean our understanding of the nature and structure of the atom? Well, first would be whatever Greek it was that decided everything must be made up of indivisible objects or "atomos". In the 1930s, at the Cavendish lab of Cambridge University, the electron and proton were discovered. I think it was Enrico Fermi who discovered the neutron. It wasn't until later high energy particle accelerators or "atom smashers" [a misnomer since they don't really smash atoms, but parts of atoms] were built that we discovered the numerous quarks that make up things like electrons and protons.
Do a Google or Yahoo search for things like Cavendish Lab, people like James Chadwick, Enrico Fermi, and places like CERN and Fermilab.