-
500 BCE
The Alchemist
They developed a theory that all metals are composed of mercury and sulfur -
400 BCE
Democritus
He introduced the atom as the building block of all matter. -
350 BCE
Plato
He introduced the idea in which ideal geometric forms serve as atoms -
Robert Boyle
He made the Atomic theory, which helped define the atom. He said that any substance that can be broken into 2 or more substances is not an element. -
Antone Lavoisier
He created the law of conservation of mass -
John Dalton
He was the first scientist to explain the behavior of atoms in terms of measurement -
Dimitir Mendeleev
He devised the periodic classification of the chemical elements -
JJ Thompson
He discovered the electron -
Pierre and Marie Curie
They discovered the highly radioactive elements known as Polonium and Radium -
Albert Einstein
Worked on the atom/atomic bomb and proved that matter can be manipulated -
Ernest Rutherford
He was the first to discover that atoms have a small charged nucleus -
Neil’s Bohr
He developed the Bohr model of the atom and he proposed the idea of energy levels of electrons are discrete -
Henry G.J. Mosley
He created the concept of the Atomic number and he said the atomic number = amount of charges in a nucleus -
Erwin Schrodinger
Used/created mathematical equations to describe the location of a certain position of an electron -
Werner Heisenberg
He formulated quantum mechanics in terms/ he made the uncertainty principal -
James Chadwich
He discovered the neutron -
Robert Millikan
He deducted the electric charge of an electron. He also produced the nuclear atom as the result of the gold foil experiment.