x 105/2) – 45.38 = 324000 b) 5.32 x 10-15 * 2.447 x 1016 = 130. c) (3.15 x 10-1 – 9.7 x 10-3) * [(4.7 x 10-2)/(2.33 x 10-3)] = 1.5 x 10-2 d) 1.62 x 10-3 + 8.1 x 10-4 = 2.4 x 10-3 e) (0.45 + 167.6)/1.6 x 10-2 = 11000 4) a) The Bohr radius: 5.29 x 10-11 b) The speed of light: 3.00 x 108 c) Charge of a proton: 1.60 x 10-19 d) Rydberg constant: 1.10 x 107 5) a) Antilog 0.485 = 3.05 b) Ln 60 = 4.1 c) e-1.41 = .244 d) Log 3.975 x 10-2 = -1.401 e) Antilog
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A scientific model is a representation of an idea‚ an object or even a process or a system that is used to describe and explain phenomena that cannot be experienced directly. Periodicity is the quality or character of being periodic. The term periodic reflects the facts that the elements show patterns in their chemical properties in certain regular intervals. Two of the more common models include Bohr Model and Lewis Dot Model. Models play a very important role in the modern world i.e.‚ making predictions
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limit = 365 nm n = 3‚ ¦Ë = 656.3 nm‚ ¦Á‚ color emitted: red n = 4‚ ¦Ë = 486.1 nm‚ ¦Â‚ color emitted: bluegreen n = 5‚ ¦Ë = 434.1 nm‚ ¦Ã‚ color emitted: violet n = 6‚ ¦Ë = 410.2 nm‚ ¦Ä‚ color emitted: violet Although physicists were aware of atomic emissions before 1885‚ they lacked a tool to accurately predict where the spectral lines should appear. The Balmer equation predicts the four visible absorption/emission lines of hydrogen with high accuracy. Balmer’s equation led physicists to find
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small atoms that can easily slip past each other. 350 BC 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. He did not conduct experiments or use scientific method for atomic theory. . 1800 AD It was John Dalton who determined that each chemical element is composed
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History of the Atomic Model Just as we once believed that the earth was flat‚ our understanding of the atom was once extremely limited. As time passes‚ we begin to discover more and more about the world we live in. We have come to know much about the atom over the past two hundred years through the work of numerous brilliant scientists. Throughout history‚ scientists have come up with many experiments and atomic models to explain the atoms all around us‚ all leading up to our modern understanding
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Niels Bohr is a big person in the history of chemistry. If it wasn’t for him we would not have known as much as we do now about the atom. He came to a conclusion of so many unanswered questions people were left after the discovery of the electron. He also participated in the United State’s biggest project that helped us win World War II. If it wasn’t for Niels Bohr we probably would not have as many things as we do today. He is one‚ if not‚ the biggest person in the history of Chemistry. Niels
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Atomic Theorist Niels Bohr Niels Bohr was born on October 7‚ 1885 in Copenhagen‚ Denmark. His father was Christian Bohr‚ a prominent physiologist and a professor at Copenhagen University. His mother was Ellen Adler Bohr‚ the daughter of a wealthy Jewish banker. As Bohr grew up‚ he was surrounded with his fathers work. This ignited his interest in physics from a young age. Bohr enrolled in Copenhagen University in 1903 to study physics. He received his masters in 1909 and then a doctors degree in
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The Atomic Model has changed over time‚ as the years‚ decades‚ and centuries go by we get a better understanding of the atom and what it looks like. The Atomic Model has changed drastically based on the understanding we have on it‚ each new model has added more information to what we know about it‚ making it easier for scientists and the world to understand. The Atomic Model is a very important part of Science and Chemistry‚ it helps explain the structure and what is inside the atom‚ the particle
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Explanation Esmeralda Vargas Atomic Model Project What is an atom? An atom is the basic unit of a chemical element‚ but‚ did you know what an atom is made out of even smaller particles? An atom is made out of protons‚ neutrons‚ and electrons. Aside from that‚ inside an atom there is
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Mouyal‚ Daniel Chemistry-5 Mr. Lawson 12/14/12 Neils Bohr Niels Henrik David Bohr was born in Copenhagen on October 7‚ 1885‚ as the son of Christian Bohr‚ Professor of Physiology at Copenhagen University‚ and his wife Ellen‚ née Adler. Niels‚ together with his younger brother Harald (the future Professor in Mathematics)‚ grew up in an atmosphere most favourable to the development
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