Chap 2 Sec 7-9

Chap 2 Sec 7-9 - Chapter 2.7 Bonding Aside from Dimensional...

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Chap 2 Sec 7-9.doc Page 1 9/09 Chapter 2.7 Bonding Aside from Dimensional Analysis this is one of the most important sections you will study and learn. The most important features of this section are knowing the difference between ionic and covalent bonding, being able to identify ionic and covalent compounds, Ionic Compounds Elemental form (zero charge) #p = #e . An element can: lose electrons to become a positive (+) ion (a cation ) or gain electrons to become a negative (–) ion (an anion .) Ionic compounds, involve electron transfer and charged particles called ions Ions can be formed from the reaction of metal with a nonmetal The metals form cations and the nonmetals form anions The charges on many main group elements can be predicted: Metals ( and NH 4 + )form cations
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Chap 2 Sec 7-9.doc Page 2 9/09 The positive charge on many cations is the same as the “A” group number of the metal Nonmetals form anions The negative charge on the anion is equal to the number of spaces to the right we have to move in the periodic table to get to a noble gas. Examples Ba is in group 2A and when it becomes an ion – it becomes a 2 + ion, Ba 2+ . It has 56 electrons and would like to have the same number of electrons as the nearest inert gas which is Xe (54 electrons). It needs to lose 2 electrons and then the charge becomes unbalanced.
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This note was uploaded on 04/06/2010 for the course CHEM 1A taught by Professor Okamura during the Fall '08 term at UC Riverside.

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Chap 2 Sec 7-9 - Chapter 2.7 Bonding Aside from Dimensional...

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