PPT-Modern Atomic Theory

Physical Science State Standards CLE3202Inq1 Recognize that science is a progressive endeavor that reevaluates and extends what is already accepted Review of First Models Democritus Used . 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). 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. At the end of this lesson, you need to draw . a diagram for each model showing the evolution of atomic theory:. ". Plum-Pudding" Model. Rutherford . Atom. Rutherford-Bohr . Atom. Charge-Cloud . Model. 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. 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”. Review & Introduction for Science 10. Vocabulary. ATOM. :. smallest particle of an element, has a neutral charge.. ELEMENT. :. made up of 1 type of atom (. eg. . Oxygen, . O. ). COMPOUND:. . a pure substance made up of 2 or more elements that are . Atomic Theory Timeline . Scientific knowledge builds on past research and experimentation.. Democritus. 400 B.C.. Information. Atomic Model. Analogy. Democritus, a philosopher in ancient Greece,. . began the search for a description. 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. . The atom: from philosophy to scientific theory . 400 BC . – . Democritus. came up with the idea of the . ________. Nature’s . basic particle. ______________. His ideas were not useful in explaining chemical behavior because . 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.. 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.. In your notes…. Draw a model of an atom that best represents each component of that atom.. Foundations of Atomic Theory. Particle Theory of Matter. Democritus in 400 B.C.. Stated that nature’s basic particle was the atom (“indivisible” in Greek). .