-
427 BCE
Plato
Plato demonstrated that different atoms could be broken down into different shapes. -
396 BCE
Democritus
He figured out that everything was made of small particles he called atoms -
300 BCE
The alchemists
metals are composed of mercury and sulfur and that it is possible to change base metals into gold. -
Rober Boyle
He helped define what an atom was -
Antone Lavoisier
He showed that elements did not have indivisible particles. -
John Dalton
His atomic theory stated that all elements were made of tiny particles called atoms. -
Dmitri Mendeleev
He added multiple elements to the periodic table -
Robert Millikan
He measured the charge on an electron. -
Pierre and Marie Curie
discovered that radiation comes from the atom itself. -
Albert Einstein
Einstein developed the atomic bomb by using nuclear fission. -
Henry G.J. Mosely
Created the periodic table -
Ernest Rutherford
he discovered that an atom is mostly empty space. -
Neils Bohr
Electrons move around a nucleus, but only in prescribed orbits, and If electrons jump to a lower-energy orbit, the difference is sent out as radiation. -
JJ Thompson
He discovered the electron -
James Chadwich
he discovered neutrons. -
Erwin Schrodinger
He made a different type of atomic model