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The brake down the chemical state for the basic element. This helped lay a foundation for the periodic table https://prezi.com/t50cihtay12m/alchemy-and-its-contributions-to-the-atomic-theory/ -
He introduced atomic theory in which ideal geometric shapes tar atom according to which atoms broke down. He made the solar system model That shows the plants in order from the sun it is also used as a analogy to show how a atom is. http://abyss.uoregon.edu/~js/glossary/plato.html -
Democritus introduced the idea that that atoms as the basic building block of matter.
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He explained that all gases have tiny particles. Also conducted the universal corpuscular theory https://www.bbc.co.uk/history/historic_figures/boyle_robert.shtml -
The total mass of products and reactants in a chemical section is always the same http://chemed.chem.purdue.edu/genchem/history/lavoisier.html https://www.britannica.com/biography/Antoine-Lavoisier -
Daltons atomic theory was the first attempt to describe all matter. In terms of atoms cannot be destroyed. He thought that atoms were small particles in matter and he imagined them like hard spheres or billiard balls. https://flexbooks.ck12.org/cbook/ck-12-middle-school-physical-science-flexbook-2.0/section/3.11/primary/lesson/democrituss-idea-of-the-atom-ms-ps/ -
The elementary gases such as hydrogen, nitrogen were composed of two atoms. https://www.famousscientists.org/amedeo-avogadro/ -
He showed that all atoms contain tiny negatively charged subatomic particles or electrons. He also made a model that explains the electrons orbit about a tiny positively charged. https://www.khanacademy.org/science/chemistry/electronic-structure-of-atoms/history-of-atomic-structure/a/discovery-of-the-electron-and-nucleus -
They discovered that radioactivity for the emission of ionizing penetrating rays by certain atoms.They also found the elements Radium and polonium. https://www.atomicheritage.org/profile/marie-curie -
He mathematically proved that the existence of atoms. And helped revolutionize all sciences. https://www.nobelprize.org/prizes/physics/1921/einstein/biographical/ -
He was a chemist that devolved the periodic Classification of the elements. Chemical elements were arranged by atomic weight. https://www.britannica.com/biography/Dmitri-Mendeleev -
Robert Milkman succeed in precisely determining the magnitude of the electrons charge. https://www.nobelprize.org/prizes/physics/1923/millikan/fact -
He found that the atom consist mostly of empty space with its mass in a central positively charged nucleus. https://www.britannica.com/biography/Ernest-Rutherford -
He proposed a theory for the hydrogen atom. His model explained why atoms only emit light.
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He discovered that the atomic number is the number of positive charges in the nucleus. https://www.britannica.com/biography/Henry-Moseley https://www.famousscientists.org/henry-moseley/ -
He created a wave equation that accurately calculated the energy levels of electrons on atoms. He also made a model that shows a particular area in which a electron s likely to be. https://www.nobelprize.org/prizes/physics/1933/schrodinger/facts/ -
He formulated atomic mechanics and in discovering the uncertainty principle.Electrons emit radiation between fixed orbits around the nucleus. https://www.britannica.com/biography/Werner-Heisenberg https://www.nobelprize.org/prizes/physics/1932/heisenberg/facts/ -
He made a fundamental discovery in the nucleus of the existence of neutrons. https://www.nobelprize.org/prizes/physics/1935/chadwick/biographical/
https://www.atomicheritage.org/profile/james-chadwick