MonatomicIons - (Group 5A, 5 - 8 = -3) 4. Transition metals...

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Determining Charges on Monatomic Ions 1. Metals form cations; nonmetals form anions. 2. Main-group metals tend to form cations with charges equal to their group number (North American system). Examples: Na + (Group 1A, 1+) Mg 2+ (Group 2A, 2+) Al 3+ (Group 3A, 3+) 3. Nonmetals tend to form anions with charges equal to their group number minus 8. Examples: F (Group 7A, 7 - 8 = -1) O 2– (Group 6A, 6 - 8 = -2) N 3–
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Unformatted text preview: (Group 5A, 5 - 8 = -3) 4. Transition metals and some heavier main group elements can form more than one kind of cation. Examples: Cu + & Cu 2+ Fe 2+ & Fe 3+ Co 2+ & Co 3+ Cr 2+ & Cr 3+ Tl + & Tl 3+ 5. Ionic charges greater than 3 are not real. Compounds in which an element might be assigned such high charge are probably molecular (or less commonly, network solids)....
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This note was uploaded on 03/01/2012 for the course CHEM 116 taught by Professor Robertcarter during the Spring '07 term at University of Massachusetts Boston.

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