PPT-Rutherford's atom How did he know what was inside an atom?

FP7ScienceinSociety20121 Grant Agreement N 321403 Geiger amp Marsdens results 2 FP7ScienceinSociety20121 Grant Agreement N 321403 Explore Draw this to scale 1mm 10 counts . 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. 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. Democritus. This is the Greek philosopher Democritus who began the search . for a description of matter more than 2400 years ago. He asked:. Could matter be divided into smaller and smaller pieces . (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.. Portfolio. Mrs. McGee. AP English 12 2B. Table of Contents. Slide 3 Introduction . Slide 7-10 Research paper AP 12: Atoms. Slide 14-15 Descriptive Writing Honors 9. Slide 19 Visual Representation of My Writing Process 12. Chemistry. Learning Goals . To be able to . explain and draw atomic structure. Elements. Elements are the . building blocks. of all . matter. on Earth. Elements are made up of . atoms. Differences in . Edan Bainglass. Jose Chavez. Kennedy Izuagbe. After his discovery of alpha particle emissions from a radioactive isotope of Radon gas, for which he was awarded the 1898 Nobel prize in Chemistry, Rutherford spent a considerable amount of time and effort into their investigation. Textbook Pages 4-5. Lesson Objectives. Appreciate that there are various models to illustrate atomic structure. Know that early models of atomic structure predicted that atoms and ions with noble gas electron arrangements should be stable. Page 162. Super Model. Start a new thread/topic. Learning Target: How can you determine the structure of something you cannot see?. Update TOC. Super Model. Read Intro p. 162-163. Since we can’t see an atom, we are going to use different types of models to help us visualize atoms.. DO NOW:. 1. 2. 3. 4. The Greek Concept of . Atomos. : . The . Indivisible Atom. . Around 440 BC, Leucippus originated the atom concept.. His pupil, Democritus (c460-371 BC) extended it . There are five major points to their atomic idea.. Five Experiments You Should Know. J. J. Thomson’s Cathode Ray. English physicist J. J. Thomson studied electrical discharges in partially evacuated tubes called . cathode-ray tubes. . He found that when high voltage was applied to the tube, a “ray” he called a . . 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 .