PPT-Modern Atomic Theory (a.k.a. the electron chapter!)

Excited Gases amp Atomic Structure Atomic Line Emission Spectra and Niels Bohr Bohrs greatest contribution to science was in building a simple model of the atom It was based on an understanding of the. 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. cont’d. Ms. McGrath . Chemistry 11. Aufbau. . principle. States that in going from a hydrogen atom to a larger atom, you add protons to the nucleus and electrons to orbitals . You start at the orbitals having the lowest energy level and fill them, in order of increasing energy, until you run out of electrons. Principal Source:. Boltzmann’s Atom. David Lindley, The Free Press, . New York 2001. Atom. Greek ‘Uncutable’ . Universe composed of indivisible objects. Philosophy and Atomic Theory. Titus Lucretius . I. Foundations of the Atomic Theory. A. 400 B.C. –Democritus. 1. Defined nature’s basic particles as . atoms. a. means indivisible. B. 350 B.C. Aristotle. 1. said matter was made of the 4 “elements”. Pre-AP Chemistry. Charles Page High School. Stephen L. Cotton . Section 4.1 Defining the Atom. OBJECTIVES:. Describe. Democritus’s ideas about atoms.. Section 4.1 Defining the Atom. OBJECTIVES:. Explain. Chapter 3. Types of Models – Why do we use models?. Physical Model vs. Conceptual Model. Physical model. is a representation of a very large or small object shown at a convenient scale. . Mrs. Medina. 1. Why do metals glow when heated?. 2. Models of the Atom. A model should explain not just what the material is made of (composition) but also how it is going to behave (changes).. Rutheford’s. 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.. Jennie L. Borders. Warm-Up Feb. 24. What did Rutherford discover?. What charge does a neutron have?. How many electrons can the first energy level hold?. Section 4.1 – Studying Atoms. Democritus. believed that all matter consisted of extremely . The Modern Atomic Theory: A Closer Look at the Electron Blocks in The Periodic Table = s block = d block = p block = f block 1 2 3 4 5 6 7 Row # Where is the Electron? In the quantum mechanical model, the electrons are found 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.. Mrs. Medina. 1. Why do metals glow when heated?. 2. Models of the Atom. A model should explain not just what the material is made of (composition) but also how it is going to behave (changes).. Rutheford’s.  Joint Workshop with IAEA on Uncertainty Assessment for Atomic and Molecular Data. ITAMP, July 8 2014. Calculation of dissociative electron attachment cross sections. 0. 1. 2. 3. 4. 5. 6. 7. Dissociative Electron Attachment (DEA) is a basic physical process that may occur in plasmas, or in everyday materials bombarded by ionizing radiation.. 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..