CHEMICAL-BONDING-COVALENT-and-IONIC-BOND.docx - 1 CHEMICAL...

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3.1.2. LEWIS SYMBOL (Electron-Dot structure)-is the chemical symbol of an element surrounded by dots equal in number to the number ofvalence electrons present in atoms of the elements.Lewis symbol is a short hand system for designating the number of valence electronspresent in atoms of an element.Introduced by an American Chemist Gilbert Newton LewisThe knowledge of electron configuration is necessary to construct a Lewis Symbol.The general practice in writing Lewis symbols:1.The element nitrogen,7N2.The electron configuration of7N is, 1s22s22px12py12pz13.Write the symbol of nitrogen N representatively the nucleus of the atom of nitrogen4.Nitrogen has one pair of non-bonded electrons and three single bonding electrons. Thetotal valence electrons of nitrogen are 5. These 5 valence electrons have to bedistributed around the symbol.5.It makes no difference on which side of the symbol the process of ___ dots begins, butjust like the electron configuration, add a dot on each side and then complete it to two.dbThe Lewis symbol is of practical use in organic chemistry.THREE IMPORTANT GENERALIZATIONS ABOUT VALENCE ELECTRONS CAN BE DRAWN FROMLEWIS SYMBOLS1.Representative elements in the same group of the periodic table have the same numberof valence electrons.

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Term
Spring
Professor
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Tags
Atom, Periodic Table, Noble gas, Valence electron, Lewis symbols

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