PPT-Specification: Simple model of the atom, including the proton, neutron and electron.

Constituents of the atom JJ Thomson 18561940 In 1897 JJ 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. precision measurements: what do they provide?. precision experiments part of large facilities. precision experiments with neutrons. Precision experiments. Electroweak precision experiments. proton decay measurements. Elemental humor. Explain the science behind this:. A proton, neutron, and electron went out to dinner one night.  After a luxurious meal, the waiter brought . their checks . to the proton and the electron.  The neutron was perplexed as to why the waiter didn't bring him his check.  So, he summoned the waiter to the table and asked him about it.. Saturday Physics for Everyone. November 9, 2013. (With debts to Chris Quigg, Leonard Susskind, Hitoshi Murayama). Why is there mass?. What . is mass?. Mass is . stuff. Mass is the . stuff. that gravity acts on. and . Molecular . Geometry. Hemoglobin. Models. . Models are attempts to explain how nature operates on the microscopic level based on experiences in the macroscopic world.. Models can be . physical. Electron. -. ve. charged particle. Outside of nucleus. Thomson’s discovery. Mass = 9.11 x 10. -28. g. Charge = -1.76 x 10. 8. C (coulombs). Proton. +. ve. charged particle. Inside nucleus. Rutherford’s discovery. Today you need your notebook and Laptop. Open the PowerPoint on the weebly. . In your notebook answer the following questions: . What two particles does the nucleus contain?. Which subatomic particle has the smallest mass?. What are the 3 major parts of an atom?. Proton . Neutron . Electron. Parts of an Atom. Another Model. SIMPLIFIED MODEL.. PROTON. Protons are positively charged particles found in the atomic nucleus. . . Beta decay. seen at quark level. . . A quark emits a W or W- and changes its flavor (type).. . Beta decay. leading a positron. It travels a short distance before encountering an electron in the material, where it annihilates to two gamma rays (photons) of .511 MeV each.. 4.1 Early Theories of . Matter (& Early Chemistry – Alchemy and Related). 4.2 Subatomic Particles & Nuclear Atom. 4.2.5 Ultimate Structure of Matter – The Standard Model (Not in Book). Section 4.1 Early Ideas About Matter. 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). Chemistry. Basics of the Atom . Subatomic. Particle. Charge. Location in. the Atom. Mass. a.m.u.. : unit used to measure mass of atoms. “atomic mass unit”. proton. neutron. electron. 1 . 0. 1–. The Atom Chapter 11 Section 2 What is an atom made of? Inside the Nucleus Atomic Mass Unit – unit of mass that describes the mass of an atom or molecule. Protons = POSITIVE charge (1 proton = 1amu.) Bohr’s 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. . The Complete Modern Atom. An atom is:. mostly empty space. . nucleus has . most of . mass. of an atom . Atom is divisible. Protons (+1 charge). Neutrons (no charge). Electrons (-1 charge). nucleus contains protons & neutrons.