periodic table chart
periodic table chart Chem 1211k 025
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This 1 page Class Notes was uploaded by Kenny Fenelon on Monday September 21, 2015. The Class Notes belongs to Chem 1211k 025 at Georgia State University taught by Dr.Tracy Kerr in Summer 2015. Since its upload, it has received 47 views. For similar materials see Principles of Chemistry I in Math at Georgia State University.
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Date Created: 09/21/15
Name Period Date Ch 6 Quiz Review Periodic Table Period horizontal row 7 periods Group or family vertical column 18 groups Dobereiner arranged elements into triads Mendeleev arranged elements in order of increasing atomic mass N ewlands developed the law of octaves Moseley arranged elements in order of increasing atomic number Group 1 alkali metals most reactive group of metals Group 2 alkaline earth metals Group 13 boron family Group 14 carbon family Group 15 nitrogen family Group 16 oxygen family Group 17 halogens most reactive group of nonmetals Group 18 noble gases don t react with anything Valence electrons those electrons involved in chemical bonding Transition elements lling a d sublevel often have colored ions more than one oxidation number Inner transition elements lling an f sublevel Coulombic attraction attraction of the positive nucleus for electrons Shielding effect repulsion of the valence by the kernel electrons Electronegativity ability of an atom to attract electrons in a chemical bond noble gases don t have electronegativity values because they don t form bonds Ionization energy energy required to remove an electron from an atom Periodic law properties of the elements are periodic functions of atomic number Properties of metals luster good conductors of heat and electricity ductile malleable lose electrons easily to form positive ions located on the left side of periodic table Properties of nonmetals dull brittle poor conductors of heat and electricity gain electrons easily to form negative ions located on the far right side of the periodic table Properties of metalloids or semimetals intermediate of those of metals and nonmetals located on the staircase line of the periodic table between metals and nonmetals Periodic Trends Atomic radius decreases left to right across a period because of increased nuclear charge coulombic attraction increases top to bottom down a group because of increased number of energy levels and increased shielding effect Ionization energy increases left to right across a period because of coulombic attraction decreases from top to bottom down a group because of increased number of energy levels and shielding effect Electronegativity increases left to right across a period because of coulombic attraction decreases from top to bottom down a group because of increased number of energy levels and shielding effect
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