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Thecrizes that these solids froms of matter are composed of indivisble elements shaped like a triangle -
Introduced the idea of the atom as the basic building block, atoms were uniform, solid, hard, incompressible, and indestructible and that they moved in infinite numbers through empty space until stopped -
Laid the ground work for many chemical process, all metals were formed from two principles — mercury and sulfur. -
Robert Boyle Domonstracting that matter is made of tiny particles -
a series of experiments found that the total mass, defined that matter was composed of atoms that were not created or destroyed during chemical reactions. -
suggested that all matter was comprised of indivisble indestructible, All matter is composed of extremely small particles called atoms. -
Made a hypothesis about equal values and volumes of the sea, equal volumes of gases at the same temperature and pressure contain the same number of molecules regardless of their chemical nature and physical properties. -
“elements arranged according to the value of their atomic weights present a clear periodicity of properties -
Presisly Determing the magnitude of the electrons charge -
J.J. Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. -
She suggested that the powerful rays, or energy, the polonium and radium gave off were actually particles from tiny atoms that were disintegrating inside the element -
mathematically predicted the size of both atoms of molecules, any liquid is made up of molecules -
Rutherford's atomic model became known as the nuclear model. In the nuclear atom, the protons and neutrons, which comprise nearly all of the mass of the atom, are located in the nucleus at the center of the atom. -
proposed a theory for the hydrogen atom, some physical quantities only take discrete values. -
arranged the elements in the periodic table according to atomic numbers -
positively charged protons and neutral neutrons bound together as the atom's nucleus, with negatively charged electrons occupying energy levels surrounding the nucleus.