52_100_Lecture_2

52_100_Lecture_2 - The Four Elements of Antiquity Earth:...

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1 The Four Elements of Antiquity Earth: represents the solid state of all matter Water: characterizes change and represents the liquid state Air: the gaseous form of matter with is mobile and dynamic Fire: power to transform solids into liquid, into gases, and back again We have come a long way…
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2 The Periodic Table Family or group Period Elements in the same group show similar reactivities
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3 The Periodic Table Main group or Representative Elements Transition Metals Lanthanides & Actinides
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4 The Periodic Table The periodic table is arranged by increasing atomic number Group 1: Alkali Metals Group 2: Alkaline Earth Metals Group 16: Chalcogens Group 17: Halogens Group 18: Nobel Gases (Inert Gases)
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5 Key Definitions Chemistry: the study of all forms of matter Matter: anything that possess mass and occupies space Atom: the smallest electrically neutral particle of an element that we can identify as that element and it cannot be broken down by chemical or physical means Element: any substance that is composed of only one type of atom
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6 How Small Is An Atom? They are too small to see with the most powerful optical microscope A gold atom is 0.00000003 cm A 20 oz water bottle is 591 mL. H 2 O is the chemical formula for water There are 19,500,000,000,000,000,000,000,000 O atoms There are 39,000,000,000,000,000,000,000,000 H atoms Most people would be happy with $ 1,000,000 1 cm
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7 Can We Split the Atom? Atoms are “split” by hitting them with high energy particles. Proton: a positively charged subatomic particle (+1) Neutron: a neutral subatomic particle Electron: a negatively charged subatomic particle (-1) Nucleus: a positively charged central core of the atom that contains the protons and neutrons Electron Orbitals (Shells): region within an atom in which the electrons can be found
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8 Particle Mass (g) Location in atom Charge Neutron 1.67 x 10 -24 Nucleus 0 Proton 1.67 x 10 -24 Nucleus +1 Electron 0.0009 x 10 -24 Outside Nucleus -1 Comparison of Subatomic Particles
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9 Representations of Atoms
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10 Why Care About Subatomic Particles?
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This note was uploaded on 04/03/2008 for the course CHEM 101 taught by Professor Hawrelak during the Fall '07 term at Bloomsburg.

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52_100_Lecture_2 - The Four Elements of Antiquity Earth:...

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