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Chemical 17 11 Diploma in Chemical Engineering 2 Mechanical Diploma in Mechanical Engineering 3 Electrical Diploma in Electrical Engineering 4 Instrumentation Diploma in Instrumentation Electronics Electronics Comm Electronics Tele Comm unication. Lab no. 6. In . analytical chemistry. , . Atomic absorption spectroscopy. (AAS). . is a technique for determining the concentration of a particular metal . element. . (e.g. Fe, Cu, Al, Pb, Ca, Zn). by . Tiffany, Katelyn, Veronica, . Kole. John Dalton (1766-1844). John Dalton was born into a Quaker Family.. Born: September 6. th. , 1766 in Cumberland, England. He was an English . Meteorologist and then. 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. 1.c. – Students know how to use the periodic table to identify alkali metals, alkaline earth metals and transition metals, trends in ionization energy, electronegativity, and the relative sizes of ions and atoms.. Advanced Chemistry. Ms. . Grobsky. Food For Thought. Rutherford’s model became known as the “planetary model”. The “sun” was the positively-charged dense nucleus and the negatively-charged electrons were the “planets”. https://youtu.be/. hhbqIJZ8wCM. What is an Atom?. The simplest particle of an element that retains its properties.. Who is Democritus?. This Greek philosopher was among the first to suggest the existence of atoms . Bohr’s model explained an unusual event. When electric current flows through a gaseous element, the gas . produces a glowing light, like a neon sign.. If this light is passed through a prism, a pattern of lines appears, with each line having a different color. The pattern depends on the element- neon has one pattern and helium another. What causes these lines and why are they always the same for a given element?. 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”. 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.. FDR receives a letter from Albert Einstein. Informed FDR of recent developments in splitting uranium atoms. Could lead to “extremely powerful bombs of a new type” by means of nuclear fission. Nucleus absorbs a neutron, breaks into two equal fragments. SPECTROSCOPY (Chapter 8). Atomic spectroscopy techniques. :. Optical spectrometry. Mass spectrometry. X-Ray spectrometry. Optical spectrometry. : . Elements in the sample are atomized before analysis.. 1. What is an atom’s atomic radii?. 2. What happens to atomic radii across a period? Why?. 3. What happens to atomic radii as you move down a group? Why?. Practice problems, page 144. Ionization Energy. 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.. Chapter 5. Sub Topics. Introduction to Atomic Spectroscopy. Atomic . Absorption Spectroscopy AAS. Atomic . Emission . Spectroscopy. AES. Interferences and Comparisons. Atomic Absorption and Emission Spectroscopy.