PPT-Order of discovery of sub atomic particles

Particle Date Scientist Electron 1897 JJ Thomson Proton 1919 Ernest Rutherford Neutron 1932 James Chadwick Shield Source of alpha particles Very thin gold foil Vacuum air pumped out. 2:. Atomic Theory. and Structure. (. c. 400 B.C.. ) Democritus proposed that “. atomos. ” are . indivisible. .. Atom. : . smallest particle . of matter that . retains its properties. .. Early Models of the Atom. All matter is composed of atoms!. Just how small are these atoms?. A quick gamble... Would I better off with $1000 or…. A million gold atoms. A billion gold atoms. A gold atom for every second since the beginning of time. Cryo. -EM. Lindsey . Organtini. 8-16-13. Structure Work Group. Virus assembly. Structure is a key element in understanding viral assembly. X-Ray crystallography can resolve atomic structural information, so why not use it?. On your bell work . sheet, answer the following.. When . are zeros significant? . . When . do you use the fewest number of Significant Figures?. Objectives. The Structure of the Atom. Properties of Subatomic Particles. Chemistry. Videos . Atomic Theory: Dalton, Democritus, Thomson, Rutherford, and Quantum. History of the . atom. . History of the atom Video #2. The Development of the Atomic Theory. J.J. Thomson . Contribution. Subatomic Particles. subatomic-lower (or smaller) than an atom. Protons-positive particles. Neutrons-neutral particles. Electrons-negative particles. Location of particles. Protons and neutrons are in the nucleus (core) of the atom.. Ernest Rutherford. Determined the structure of the atom. First to split the atom. Hans Geiger . Inventor of the Geiger counter to measure radiation. Ernest Marsden. Found that a few scattered alphas at angle over 140 degrees from the beam. The lab technician shown here is using a magnifying lens to examine a bacterial culture in a petri dish. When scientists cannot see the details of what they study, they try to obtain experimental data that help fill in the picture.. Everything made of small particles. Called . atmos. Earth, air, fire, and water. Antoine Lavoisier. Law of Conservation of Mass . Mass cannot be created or destroyed. Mass of reactant= mass products. Science is based off of observations.. A Scientific Law is a summary of what is seen in observations. . A Scientific Theory is an explanation of why these observations are occurring.. Both laws and theories are tested by using them to predict what would happen in certain situations.. What is Today’s Model?. Dense, Positively Charged Nucleus. Mostly. Empty. Space. Negatively Charged. Electron Cloud. Most Probable Location of the Electrons. Composed of Protons, Neutrons, and Electrons. How and why has the Atomic Theory changed over time? . How can we describe the molecular motion of the states of matter? . Objectives. Students will explain that atoms are the smallest unit of an element and are composed of subatomic particles.. Over the past century scientist have discovered that the atom is composed of 3 subatomic particles:. Protons. Neutrons. Electrons. Checking for understanding. Draw this diagram. Label all subatomic particles and include their charges.. Science is based off of observations.. A Scientific Law is a summary of what is seen in observations. . A Scientific Theory is an explanation of why these observations are occurring.. Both laws and theories are tested by using them to predict what would happen in certain situations..