LewisModel-Octet

LewisModel-Octet - 1 1 1 H 1.008 H Lewis dot representation...

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Unformatted text preview: 1 1 1 H 1.008 H Lewis dot representation + 8 2 4 2 He 4.003 He + + - - Lewis dot representation In an electrically neutral atom, the number of electrons equals the number of protons 6 C 12 6 - C - In an electrically neutral atom, the number of electrons equals the number of protons 6 C 12.01 12 6 - C ++ ++ ++ - The rows and columns are defined by the distribution of electrons in defined shells or energy levels surrounding the nucleus. Lewis Dot Representation 12 6 C 6 C 12.01 28 14 Si 9 14 6p 6n Si 28.09 14p 14n Lewis Dot Representation Lewis Dot Representation Lewis representations of second row elements Lewis representations of second row elements Group 1 Group 2 • Group 3 • •• Group 4 • •• • Li • • Group 5 Be • • B • C :N • • :O: • Group 6 :F: •• Group 7 :Ne: •• •• Group 8 10 Periodic table of the elements and atomic structure • Elements are arranged in order of increasing atomic I II III IV V VI VII VIII Periodic table of the elements and atomic structure • Elements are arranged in order of increasing atomic number (number of protons) • Elements with similar chemical properties fall in the same columns (groups) (same number of valence electrons) • Elements in the same row (period) have the same number of core electrons and same number of energy levels. • Chemical properties vary in a regular way with increasing atomic number (periodicity) Chemical Bonding. The Octet Rule Ionic Bond 11 Na Cl 12 Chemical Bonding. The Octet Rule Chemical Bonding. The Octet Rule Ionic Bond Ionic Bond + Na Na + Cl Cl - Chemical Bonding. The Octet Rule Chemical Bonding. The Octet Rule Ionic Bond Ionic Bond Na•• • ••• •• Cl: •• •• 13 13 Chemical Bonding. The Octet Rule Covalent Bond • Cl: •• •• Chemical Bonding. The Octet Rule Polyatomic Molecules Chemicaldioxide Carbon Bonding. The Octet Rule Double Bonds O::O::C::O O •• •• •• •• •• •• Triple Bonds •• •• :N:•:N : • Molecular Geometry Carbon is a Group IV element. It obeys the octet rule by forming: a. Four single covalent bonds 14 ...
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