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400
Democritur
There are various basic elements from which all matter is made. -
John Dalton
He believe that all atoms of s given element are identical, elements are made of particles called atoms, and atoms cannot do crested or destroyes -
Antoine Lavoisier
He started the first version of the law of conservation of mass, recognized, and hydrogen. -
Dmitri Mendeleev
He created the periodic table -
William Crookes
He experiments with cathode-ray tubes led him to confirm the work of earlier scientists by definitively demonstrating the cathode-rays have a negative charge. -
JJ Thomson
He determined the charge to mass ratio of electrons. -
Marie Curie
She discovered radium and polonium, and coined the term radioactivity after studying the decay process of uranium and thorium. -
Albert Einstein
Published the famous equation E=mc2 -
Lord Ernest Rutherford
He discovered the concept of radioactive half life. -
H.G.J Moseley
He discovered that the number of protons in an element determines its atomic number. -
Neil Bohr
He proposed an atomic structure theory that stated the outer orbit of an atom could hold more electrons than the inner orbit. -
Louis De Broglie
He proposed that electrons have a wave/particle duality. -
Erwin Schrodinger
He viewed electrons as continuous clouds and introduced "wave mechanics" as a mathematical madel of the atom -
Aristotle
He believed all things were made of matterand essence.
