Atomic Model Time LINE

Scientist named Max Planck made a discovery that would change science forever and have a profound impact on our understanding of both light and atomic structure.Max Planck made a big step forward in our understanding of what light is and how it works. In the process, he also advanced our understanding of atomic structure. For these remarkable discoveries, he is now recognized as one of the most influential scientists of the twentieth century.

Faraday, who became one of the greatest scientist of the 19th century, began his career as a chemist. He wrote a manual of practical chemistry that reveals his mastery of the technical aspects of his art, discovered a number of new organic compounds, among them benzene, and was the first to liquefy a “permanent” gas.

Boyle mainly studied gases.  He discussed the possibility of atoms existing, however his work was greatly impeded by the church.  He attempted alchemy or turning regular metals into gold.  He made gas chambers to study from.  Unlike the greek philosophers, he was doing physical experiments.  He proposed that elements are composed of 'corpuscles' of various types and sizes that are able to organize themselves into groups that represent different chemical substances.  He also was able to distinguish between a mixture and a compound.

Proust stated the Law of Definite Proportions.  The law states that the ratio of elements in a compound is always the same/constant.    He also hinted at the 'lego'ness of matter; he believed that matter could be put together in certain patterns to make bigger, different, unique matter. He set it up for Dalton to create the Law of Multiple Proportions and ultimately his Atomic Theory . fun fact   When Napoleon invaded Spain, they burned down his laboratory.

He is also known as the father of modern chemistry proposed the law of conservation of matter. He began the conversation on what an atom was exactly Lavoisier was known for his experimentation skills.  One of his favorite experiments being turing HgO into Hg+O.  He used this experiment to help himself come up with the Law of Conservation.  The law states that matter cannot be made or destroyed.  He also hints at the rearrangement of matter in reactions.  Matter rearranged, but never disappeared .

dimitri mendeleyev was the one who created the periodic table one of the most importants discoveries in physics . This is the first periodic table in the world

From this he discovered that no matter what metal the electrodes were made up of or what type of gas was in the tube, the mass to charge ratio was unchanged. He also deducted that there were two parts of atom held together by electrostatic attraction. A heavier part, responsible for the majority of mass of the atom and a negatively charged ‘corpuscle’. This meant that Dalton’s model of an atom was incorrect, since the atom was not the smallest possible particle.

Bohr agreed with Rutherford’s proposal that in the atom the electrons revolve around a central positively charged nucleus that is responsible for most of the weight of the atom. But from his special evidence, he concluded that electrons are found at only certain distances from the nucleus, and have particular values of energy. ohr’s atomic theory also helped to explain the spectra. He explained the discrete lines on the hydrogen spectra by proposing if a hydrogen atom was given energy, an electron can jump to a higher shell, away from the nucleus. However they will always return back to their ground state as the atom will be unstable.

Chadwick had an abundance of knowledge he had gained from previous discoveries, which help him discover the neutron. In 1932, Chadwick carried out an experiment in which a sample of Beryllium was bombarded with alpha particles, which caused it to emit this mysterious radiation. He assumed it was gamma rays. He then discovered that this radiation, upon striking Paraffin Wax, would dislodged some of the protons, coming to the conclusion it was gamma rays. Chadwick, however did not believe that gamma rays could account for the protons from the wax. He was convinced that the beryllium was emitting neutrons.

He was awarded an 1851 Exhibition Science Scholarship, enabling him to go to Trinity College, Cambridge, Rutherford also designed a series of experiments to determine the size of the nucleus compared with that of an atom. He measured the angles of scattering and their frequency by using slits of various foils and different metals.

proposed that elements consisted of atoms that were identical and had the same mass and that compounds were atoms from different elements combined together, his atomic model was a simple sphere. He also stated that atoms of a given element are idntical in size, mass, and other properties.As democriyus he also thought that atoms cannot be subdivided, created, or detroyed. 

  Aristotle did not believe in the atomic theory and he taught so otherwise. He thought that all materials on Earth were not made of atoms, but of the four elements, Earth, Fire, Water, and Air. He believed all substances were made of small amounts of these four elements of matter. Most people followed Aristotle’s idea, causing Democritus’ idea- which was that all substances on Earth where made of small particles called atoms- to be over looked for about 2,000 years! Aristotle's view was finally proven incorrect and his teachings are not present in the modern view of the atom.

An ingenious escape was proposed in the fifth century B.C. by Democritus. He hypothesized that all matter is composed of tiny indestructible units, called atoms. Early atomic theory stated that the characteristics of an object are determined by the shape of its atoms. So, for example, sweet things are made of smooth atoms, bitter things are made of sharp atoms. Democritus also used to think that atoms couldn´t be subdivided or separeted.