PPT-UNIT-III ATOM WITH ONE ELECTRON

Bohrs Model Niels Bohr suggested that the problem about hydrogen spectrum can be solved if we can make some assumptions According to classical theory the frequency of the electromagnetic waves emitted by a revolving electron is equal to the frequency of revolution . Manufacturer See note A Dennison Helium and heavier atoms. (c) So Hirata, Department of Chemistry, University of Illinois at Urbana-Champaign. . This material has . been developed and made available online by work supported jointly by University of Illinois, the National Science Foundation under Grant CHE-1118616 (CAREER), and the Camille & Henry Dreyfus Foundation, Inc. through the Camille Dreyfus Teacher-Scholar program. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the sponsoring agencies. Week 1: From Schrodinger to . Hartree-Fock. Aug 25. th. –Aug 27. th. . Emilie . guidez. : . eguidez@iastate.edu. . 201 . Spedding. hall. Intro to the Schrodinger equation (SE). The objective of any quantum chemistry problem is to solve the SE. The time-independent SE (no time dependent external forces) has the form:. (around 400 BCE). Democritus thought matter could be divided into. . smaller and smaller pieces until a . single indivisible . particle is reached. . He named this particle the . atom. He proposed that atoms are of different sizes, in constant motion, and separated by empty spaces.. electron, and electron-neutrino have =+1; their anti-particles have =-1; muon, and muon-neutrino have =+1; their anti-particles have THUS, there should be two types of neutrinos: electron-kind and muo Wave-Particle Duality. JJ Thomson won the Nobel prize for describing the electron as a particle.. His son, George Thomson won the Nobel prize for describing the wave-like nature of the electron.. The electron is a particle!. model. Dr. . Mahender. Singh. Associate Professor in Physics. PGGC – 11 Chandigarh. Vector model of an atom. The total angular momentum of an atom result from the combination of the orbital and spin angular . Atoms. . are the smallest unit of matter. . Matter. . is anything that has mass and takes up space. . A . ball is matter, water is matter, even the air you breathe is matter!. What is an atom. ? (cont.). Two regions. Nucleus . protons and neutrons. Electron . cloud. region where you might find an electron. Modern View. . . . . . . .. Dalton (1803). Thomson (1904). (positive and negative charges). . b)Electro Negativity. . . Anitha. . George Varghese. Dept. of Chemistry. Marthoma. College. ELECTRON . AFFINITY (ELECTRON GAIN ENTHALPY) . Electron gain enthalpy. . is defined as the enthalpy change taking place when an isolated . . Constituents . of the atom. J.J. Thomson. (1856-1940) . . In 1897 J.J. Thomson discovered the . electron. . This is a tiny negatively charged particle that is much, much smaller than any atom. He said that the tiny negatively charged electrons must be embedded in a cloud of positive charge. Thomson imagined the electrons as the bits of plum in a plum pudding, rather like currants spread through a Christmas pudding.. Our view of the atom has changed over time. 2. Aristotle . (460 B.C. – 370 B.C.). emphasized that nature consisted of four elements: air, earth, fire, and water. did not believe in discontinuous or separate atoms, but felt that matter was continuous. Rutherford proposed that most of the mass of the atom was concentrated. . at the atom’s center. . Rutherford’s Model of the Atom. Rutherford’s experiment suggested that an atom’s positive charge is concentrated in the center of the atom . Leading TV Unit Manufacturer in Pune Innovative Designs, Superior Quality at Adeetya's Kitchen & Furniture https://adeetyas.com/tv-unit-manufacturers-in-pune.php