modern concept of the atom. I am going to give a brief history of the atomic model including Thomson’s atom‚ Rutherford’s atom‚ Bohr’s atom‚ and Schrödinger’s atom. I am going to include a diagram for each of these models. In 1897 physicist‚ J.J. Thomson‚ shortly after discovering electrons‚ proposed his Plum-Pudding model of the atom. He based this model on the two facts that he knew at the time: 1. atoms contain small negatively charged particles called electrons and 2. atoms behave as if they
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He recognized and named oxygen in 1778 and hydrogen in 1783 Joseph Louis Proust (1799) - a French chemist which discovered each pure compound has its own characteristic elemental composition John Dalton (December 1803) - An English chemist‚ meteorologist and physicist. He is best known for his pioneering work in the development of modern atomic theory. Amedeo Avogadro (1811) - an Italian scientist. He is most noted for his contributions to molecular theory‚ including what is known as Avogadro’s law
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NOT base your answer on tabulated values since exceptions may occur. | germanium smallest arsenic selenium bromine largest Feedback: Electronegativity is the ability of an atom in a molecule to attract electrons to itself. In general‚ electronegativity increases as the atomic radius decreases. Smaller atoms have higher electronegativities. Notice that all of these elements are in row 4. Across a row of the periodic table‚ atomic radius decreases with increasing atomic number. The
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nineteenth century‚ there were many inventions created that projected the advances in medicines and still plays a huge role today. In 1867‚ the Anti-septic surgical method was invented by Joseph Lister. Joseph Lister is known as the Father of Modern Surgery. He also designed a microscope lens. His contribution to science results him into becoming a Fellow of the Royal College of Surgeons. His first clue was from comparing different fractures of the different patients that he had. Lister saw that
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Chemistry revision Atoms elements and compounds Atom-the smallest part of an element that can still be recognized as an element Element-a substance made up of only one type of atom. An element cannot be broken down chemically into any simpler substance Nucleus-middle of the atom‚ which contains protons and neutrons Electron-tiny particle‚ which surrounds the nucleus with a negative charge Compound-when two elements react and combine together which contain more than one element. There
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Development Structure of Atoms The structure of atoms developed throughout time since 410 BCE to now. “Leucippus of Miletus (ca. 435 BCE) and Democritus of Abdera (ca. 410 BCE) developed the atomic hypothesis.” Their Theory was that the world is made up of atoms moving around in empty space‚ also in continuous motion and constantly colliding into each other. The ancient Greek philosophers were the first people to have the theory of atoms and no one continued their theory until early 1803 which
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Atoms are the smallest entities which resemble the properties of an element and cannot be broken down into smaller parts. Molecules are formed when two or more atoms are combined. This formation can happen in a variety of ways. When two oxygen atoms join O2 is formed‚ and when three oxygen atoms join O3 or ozone is formed. Both of these have different properties. Different atoms can also combine to form molecules. Hydrogen combines with sulfur to form H2S and hydrogen and oxygen also combine
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nuclei of atoms in particular patterns. You will discover these patterns (and how electrons sometimes act like passengers boarding a bus) with the Electron Configuration Gizmo™. To begin‚ check that Lithium is selected on the PERIODIC TABLE tab. 1. The atomic number is equal to the number of protons in an atom. How many protons are in a lithium atom? ________3_____ 2. A neutral atom has the same number of electrons and protons. How many electrons are in a neutral lithium atom? ______3_______
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France Residence Poland‚ France Citizenship Poland (by birth) France (by marriage) Fields Physics‚ chemistry Institutions University of Paris Alma mater University of Paris ESPCI Doctoral advisor Gabriel Lippmann Doctoral students André-Louis Debierne Óscar Moreno Marguerite Catherine Perey Known for Radioactivity Polonium Radium Notable awards Nobel Prize in Physics (1903) Davy Medal (1903) Matteucci Medal (1904) Elliott Cresson Medal (1909) Albert Medal (1910) Nobel Prize
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Introduction Atoms‚ molecules‚ compounds and mixtures‚ although they may not seem it‚ are different. Atoms make up all of the above and elements. They are made an equal amount of protons and electrons. Molecules are made when two or more atoms connect chemically. Like molecules‚ compounds are made when two or more atoms connect chemically. Unlike molecules‚ the atoms need to be two or more different elements. Mixtures are made of two or more compounds or elements. Mixtures can look completely the
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