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They developed a theory that all metals are composed of mercury and sulfur -
He introduced the atom as the building block of all matter. -
He introduced the idea in which ideal geometric forms serve as atoms -
He made the Atomic theory, which helped define the atom. He said that any substance that can be broken into 2 or more substances is not an element. -
He created the law of conservation of mass -
He was the first scientist to explain the behavior of atoms in terms of measurement -
He devised the periodic classification of the chemical elements -
He discovered the electron -
They discovered the highly radioactive elements known as Polonium and Radium -
Worked on the atom/atomic bomb and proved that matter can be manipulated -
He was the first to discover that atoms have a small charged nucleus -
He developed the Bohr model of the atom and he proposed the idea of energy levels of electrons are discrete -
He created the concept of the Atomic number and he said the atomic number = amount of charges in a nucleus -
Used/created mathematical equations to describe the location of a certain position of an electron -
He formulated quantum mechanics in terms/ he made the uncertainty principal -
He discovered the neutron -
He deducted the electric charge of an electron. He also produced the nuclear atom as the result of the gold foil experiment.