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hes the first person who had created a school -
he invented the field of formal logic and was taught by plato -
Democritus was a central figure in the development of the atomic theory of the universe -
they invented experimental techniques and laboratory tools and also developed practical knowledge about matter as well as sophisticated theories about its hidden nature and transformations.
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he discovered the role of oxygen in combustion and respiration, proved the law of conservation reformed the chemical nomenclature, and named hydrogen.
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all matter was comprised of indivisible and indestructible atoms with distinct masses and properties and he introduced the atomic theory to chemistry -
when Elements are put in increasing order of Atomic Mass the qualitys of every eighth Element starting from any Element are a repetition of the properties of the starting Element. -
presented a new paradigm with all of the elements positioned within a logical matrix -
The kinetic energy of photoelectrons increases with light frequency. -
Marie and Pierre Curie studied the radioactivity of uranium for several years they found out that the elements polonium and radium after chemically extracting uranium from the ore -
Scientists found that cathode rays as responsible for the electrical properties in matter. -
In 1897 the elctron was discovered the electron and then went on to propose a model for the structure of the atom -
light bulb filaments should be heated to a temperature of about 3,200 Kelvin to make sure that most of the energy is emitted as visible waves -
name: plum pudding model major finding: they had did experements with cathode ray tubes and it showed that atoms contain tiny negatively charged subtonic particles -
Ernest Rutherford research resulted in a reaction which led to the very first splitting of an atom -
he discovered the accurate determination of the charge carried by an electron using the elegant “falling-drop method -
the atom is mostly empty space with a tiny dense positively-charged nucleus -
the electrons travel around the nucleus of an atom in distinct circular orbits its also referred to as the planetary model of an atom -
the atomic number is the number of positive charges in the atomic nucleus He also hadf said that there were three elements nobody knew with atomic numbers 43, 61, and 75, between aluminum and gold -
describes the form of the probability waves that govern the motion of small particles -
there is a fundamental limit to what one can know about a quantum system. -
physicists knew that most of the mass in the atom was located in a nucleus at its center, and that this central core contained protons then they found another particle that had no charge and named it neutron
