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Discovered that atoms broke down mathematically into triangles. He was a student of Socrates. -
Discovered that atoms are without pores and entirely fill up the space they occupy. He saw the void as vacuum- an infinite space with an infinite number of atoms. -
Discovered that particles are in constant motion.
Discovered that no matter could be eternal, as no matter can come from nothing -
By Nicolaus Copernicus. Illustrates the relative positions and motions of the planets and moons. -
Discovered that matter is made up of tiny particles. He discovered the relationship between pressure and volume in gas. -
He named and recognized 33 substances to be considered elements including oxygen and hydrogen. Discovered that combustion was a reaction of metal or organic substance with common air. -
Proposed by John Dalton in the early 1800s. He thought that atoms were the smallest particles of matter. -
Discovered that compounds are combinations of two or more different types of atoms. His theory was based on the law of conservation of mass and the law of constant composition. -
He proposed Avagadro's Law equal volumes of gasses at equal temperature and pressure contains the same number of particles. Italian physicist and mathematician. -
Known for his discovery of periodic law- elements are arranged in order of increasing atomic weight. He was a Russian chemist and inventor. -
Discovered polonium and radium. Coined the term radioactivity and created a new field of study called atomic physics. -
He had the earliest description of the inner structure of atoms. He thought that atoms were uniform spheres of positively charged matter in which electrons are embedded. He headed the Cavendish Laboratory at Cambridge. -
By JJ Thomson. Negatively charged particles swim in a positively charged sea. -
Discovered that electrons could leave metal through the usage of light. He mathematically proved the existence of atoms and their random ceaseless motion. -
He determined the electric charge of a single electron. Conducted the Oil Drop experiment. -
Discovered that all the atoms mass is concentrated in the center and all the electrons revolve around it. He was known as the father of nuclear physics. -
Created a model of the atom that describes electrons as revolving in discrete orbits around a positively charged nucleus. He was the first to discover that electrons travel in separate orbits and that the electrons in the outer orbit determine the properties of an element. -
He demonstrates the major properties of an element are determined by the atomic number not the atomic weight. He experimented with x rays of certain periodic table medals. -
Proposed by Erwin Schrodinger in 1926. Electrons were no longer depicted as particles moving around a central nucleus in a fixed orbit. -
He discovered the neutron, and that the nucleus contains both positively and negatively charged protons and neutrons, which have the same mass. His discovery led to straight to the development of the atomic bomb.