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400
Democritus
He believed that elements were made up of little particles called "Atomas", or indestructible particles. Image from-www.arktimes.com -
Aug 22, 770
Jabir ibn Hayyan
He was the first practical alchemist and was known as the "father of chemistry. He developed an early experimental method for chemistry and isolated numerous acids including hydrochloric acid. Image from-www.ilmoamal.org -
Robert Boyle
He published The Sceptical Chymist, a treatise on the distinction between chemistry and alchemy. It contained some of the earliest modern ideas of atoms, molecules, and chemical reaction, and marked the beginning of the history of modern chemistry. Image from-www.crystalinks.com -
Henry Cavendish
He discovered hydrogen as a colouless, odourless, gas that was combustibleand can explode with a mixture of air. Image from-www.nndb.com -
Joseph Proust
He proposed the law of definite proportions, which states that elements always combine in small, whole number ratios to form compounds. Image from-en.wikipedia.org -
John Dalton
He said that Democritus's belief of Atomas was right. Image from-en.wikipedia.org -
Amedeo Avogadro
He said that different atoms combine in fixed proportions and later came up with molecules. Image from-onsager.bd.psu.edu -
Dmitri Mendeleev
He formulated the periodic law, created his own version of the periodic table and used ti to correct properties of known elements and predict undiscovered elements. Image from-www.nndb.com -
Johann Josef Loschmidt
He determined the exact number of molecules in a mole, which was later named Avogadro's number. Image from-www.ecured.cu -
Henry Moseley
He contrubuted justification from physical laws and chemical concept of the atomic number. Image from-ja.wikipedia.org -
Henri Becquerel
He discovered that some metals like uranium emitted radiation. Image from-en.wikipedia.org -
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Joseph John Thomson
He made the Thompson Model which depicted the atom as a cookie dough dotted with chocolate chips. Image from-en.wikipedia.org -
Albert Einstein
He came up with E=mc2 which meant that energy equaled mass multiplied by the speed of light multiplied by itself. Image from-www.biography.com -
Ernest Rutherford
He concluded that the atom is mostly empty space and came up with the Rutherford model. Image from-www.nobelprize.org -
Niels Bohr and James Chadwick
Niels Bohr, a physicist, and his student James Chadwick conclude that the nucleus contains positive protons and neutral neutrons, Image from-en.wikipedia.org -
Irving Langmuir
He suggested that the periodic table could be explained if the elcetrons in an atom were connected or clustered in some manner. Image from-en.wikipedia.org -
Dr. Milo Wolff
He found the wave structure of matter specifically electrons. Image from-mwolff.tripod.com -
Electron Cloud of Probability (Wolfgang Pauli)
Wolfgang's Pauli exclusion principle along with quantum mechanics helped create the Electron Cloud of Probability. Image from-en.wikipedia.org -
Aristotle
He contributed to the scientific method & metaphysics. Image from-mrsvesseymathematicians.wikispaces.com -
Period: to
20 Scientists' conrtibutions throughtout the years
