Who is famous scientist and why is the famous?

well, there's Albert Einstein and he was famous for creating the atom bomb and plenty of other things.


And

Earnest Rutherford

Rutherford performed his most famous work after he received the nobel prize for chemistry. In 1911, he postulated that atoms have their positive charge concentrated in a very small nucleus, and thereby pioneered the Rutherford model, or planetary, model of the atom.

He is widely credited with first splitting the atom in 1917.