Presentation11_061018

Presentation11_061018 - Chem 6A Presentation #11 2006-10-18...

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Unformatted text preview: Chem 6A Presentation #11 2006-10-18 1 Overview Chapter 2: Chemical Bonds Lewis symbols More on ionic bonding Lewis structures and covalent bonding 2 Lewis electron-dot symbols Lewis electron-dot symbols are used to depict the valence electrons (electrons available for bonding) of atoms for main-group elements . Chemical symbol represents nucleus and inner electrons Number of valence electrons = = Group number for groups 1 & 2 = Group number minus 10 for groups 13 through 18 First 4 dots: single dots on sides of symbol Next 4 dots: begin forming pairs with first 4 dots 3 Types of chemical bonding 4 Ionic bonding: electron transfer Main-group elements in periods 1 & 2, as well as many other main-group elements, form ions with a filled outer electron shell: 2 or 8 electrons in the outer shell, the same as in the nearest noble gas in the periodic table. 5 Ionic bonding: electron transfer Atoms of metals in the p-block of period 4 and later in the periodic table can lose their outer p and s electrons, leaving a noble- gas core as well as a complete subshell of d electrons ( d 10 ). Elements later in the periodic table may show the inert pair effect , in which the outer pair of s electrons are especially stable and are not necessarily lost when a cation forms. 6 Ionic bonding: lattice energy The lattice of an ionic solid is the array of alternating positive and negative ions that make it up....
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This note was uploaded on 01/31/2010 for the course CHEM CHEM 6A taught by Professor Czarkowski during the Fall '07 term at UCSD.

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Presentation11_061018 - Chem 6A Presentation #11 2006-10-18...

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