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500 BCE
The Alchemists
all metals are composed of mercury and its possible base metals into gold they were the first chemists they developed the tools and technique's for chemicals. -
460 BCE
Democritus
Democritus was an influential Ancient-Greek philosopher primarily famous for the contribution to the history of the atom. His theory is one of the most important theory's in the atomic theory and organic chemistry in general, his theory has effectively given the great foundation to understanding about atomic theory. -
427 BCE
Plato
Plato was a Greek philosopher who is known best as a disciple of Socrates and carries on his work on the atomic theory. Plato introduced the atomic theory in which ideal geometric forms serve as atoms, according to which atoms broke down mathematically into triangles. These shapes came to be known as "Platonic Solids." Plato's work was a great contribution for further development of the Atomic Theory. -
384 BCE
aristotle
Aristotle was an Ancient-Greek philosopher who invented a theory, which was supposedly incorrect in present-day. This theory seemed to be supported by observing things of everyday life. He believed that there were only five elements: air which was light, earth which was cool and heavy, water which was wet, fire which was hot, and earth which he viewed as a divine substance which made up the stars and planets. -
Robert Boyle
Robert was a natural philosopher, chemist, physicist and inventor. Boyle argued that matter is composed of clusters of particles and chemical changes are a result from the rearrangement of the clusters; matter's basic elements were said to consist of various sorts and sizes of particles, -
Lavoisier
Lavoisier is credited as being the first person to make use of the balance. He was known for his skills in experimentation and loved to separate the oxygen molecule from HgO. This led him to come up with the Law of Conservation, which states that matter is unable to be made or destroyed. -
Dmitri Mandeleev
Dmitri was a chemist and inventor, he invented the periodic table of elements -
John Dalton
John was an English chemist, physicist, and meteorologist. He is best known for proposing the modern atomic theory. He introduced the solid sphere of "Billiard Ball" model. -
The Curies
French physicist discovered the strongly radioactive elements which occur naturally in uranium minerals. -
JJ Thomson
JJ Thomson was an English physicist. He started studying cathode rays. These rays are glowing beams of light that show an electrical discharge in a high-vacuum tube. He introduced "Plum Pudding" model -
Ernest Rutherford
British physicist who was known to be the father of nuclear physics. He discovered that there are two different types of radiation, alpha radiation and beta radiation. He discovered that radioactivity gave rise to the formation of gases. -
Albert Einstein
Albert was a German theoretical scientist and physicist. Einstein developed the theory of relativity, one of the two main branches of modern physics. -
Henry G. J. Thomson
Henry was an English physicist who created Moseley's law which is characterized concerning x-rays that are produced by atoms -
Neils Bohr
Danish physicist who made foundational contributions to understanding atomic structure. He introduced the Solar system model -
Robert Millikan
American Physicist he succeeded in finding out the size of an electrons charge -
Werner Heisenberg
Heisenberg had a problem with the Bohr Model. The Bohr model stated the atom as a small, positively charged nucleus, surrounded by electrons that moved in circular orbits. Heisenberg said that the electrons do not move in neat orbits around the nucleus like planets. He introduced the electron cloud model .
