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460 BCE
Democritus
Greek Philosopher who developed the concept of the atom. The word "atom" in Greek is known as invisible. -
384 BCE
Aristotle
Greek Philosopher and scientist. He thought everything was made up of Earth, Air, Fire and Water. First guy to introduce and discuss matter. -
Antoine Lavoisier
Lavoisier was a French Scientist who discovered oxygen in 1772. Later on he named the the elements of Oxygen and Hydrogen, -
Joseph Louis Proust
Proust was a French Chemist, He discovered the law of definite proportions. -
John Dalton
In 1803 Dalton created the first charts of atomic weight. Dalton is also known for his atomic theory. -
Michael Faraday
Faraday discovered the electromagnetic rotation. He also discovered benzene which is on of the most important substances in chemistry. -
Henri Becquerel
Discovered radioactivity and x-rays. That eventually led to studies of how uranium salts are affected by light. -
J.J. Thompson
In 189, J.J. Thompson managed to estimate the magnitude that electricity is transmitted by a tiny particle. And he did that by doing experiments with charged particles in gases. -
Ernest Ruthford
In 1898, Rutherford studied the radiation emitted by uranium. He discovered the alpha and beta radiation. -
Marie and Pierre Currie
Their main study was radioactivity. And that led to their discovery of the elements of radium and polonium. -
Max Planck
He discovered the energy of quanta. Radiation consists of quanta with specific energies. -
Albert Einstein
Explained that light consists of quanta which he described them to be "Packets" with fixed energies corresponding to certain frequencies. Discovered the law of photo electric effect -
Robert Millikan
He discovered the magnitude of electrons charge. He is also known for his work of the change of the photoelectric effect. -
Neils Bohr
He proposed a theory for the hydrogen atom based on quantum theory. He also investigated the structure of atoms of the radiation emanating from them. -
James Chadwick
Chadwick proved that electromagnetic radiation consisted of a neutral particle with the same mass of a proton. He also discovered the neutron.
