-
Period: 460 BCE to 370 BCE
Democritus
He thought everything were made up of small particles that were eternally invariable, each of which was called an atom. Also, he concluded that an atom can not be split indefinitely into smaller parts. -
400 BCE
Atomic model of Democritus
-
Period: to
John Dalton
He thought all elements are made up of very small, no more splitting particles, of the same shape and weight. -
Atomic model of John Dalton
-
Period: to
JJ Thomson
He discovered electrons and isotopes and also analyzed the mass of atoms. -
Period: to
Ernest Rutherford
He found a proton and he thought that there was an atomic nucleus at the center of the atom, and the electrons were rotating around it. -
Period: to
Niels Bohr
He thought atoms are mostly empty space with a positively charged nucleus surrounded by electrons that rotate circular orbits. -
Period: to
Erwin Schrodinger
His model describes the probability that an electron can be found in a given region of space at a given time. It no longer tells us where the electron is, it only tells us where it might be. -
Atomic model of JJ Thomson
-
Atomic model of Niels Bohr
-
Atomic model of Ernest Rutherford
-
Atomic model of Erwin Schrodinger
