-
Believed that all metals were formed from two principles; mercury and sulfur.
-
Theorized that solid forms of matter were made up of indivisible elements. -
Realized that if a stone was divided into two halves, both halves would have the same properties. -
Believed that everything was composed of very tiny particles. This belief was called atomism. -
Proposed the idea of substances just being an element on its own and not having been made up of other substances. -
Believed that elements were made of particles called atoms and that they cannot be destroyed or created. -
Suggested that equal volumes of gases at the same temperature and pressure contain the same number of molecules. -
Believed that elements arranged according to the value of their atomic weight presents a clear periodicy of properties. -
Discovered electrons. Also discovered that an atom can be separated and divided. -
Suggested that powerful rays and energy, radium and polonium gave off were just particles from from tiny atoms. -
Mathematically proved the existence of atoms and also proved that all liquids are made up of molecules. -
Preformed the Milikan Oil Drop experiment which determined the size of electrons. It also determined that there was a smallest unit charge. -
Believed that an atom is mostly empty space with electrons orbiting the nucleus. -
Known for Mosely's Law. The Square root frequency of the x-ray emitted by an atom is equal to its atomic number. -
Received a Nobel Prize for the Bohr model which shows positively charged nucleus surrounded by orbiting electrons. -
Formulated a type of quantum mechanics based on matrices. He proposed the uncertainty relation, showing how precisely the position and velocity of a particle can be simultaneously determined. -
Earned a Nobel prize for discovering neutrons in atoms.