Nomenclature

Pure substances that are composed of 2 or more elements chemically combined in fixed proportions

Formed by 2 or more different non-metals (only)

Contain just 2 different NM's

No carbon

• 1. More metallic NM leads formula
• 2. # of each NM become subscripts in formula
• 3. Names of 2 NM's are in compound name
•      -1st element = name unchanged
•      -2nd element = ending changed to -IDE
• - extra rule on lab notes

Formed by chemical combination of metals with non metals in fixed proportions

Are always + because the always lose e- (cation)

Are always - because they always gain e- (anion)

• Group 7A: -1 charge
• Group 6A: -2 charge
• Group 5A: -3 charge
• Group 4A: -4 charge
• Exception: Group 8A = noble gasses and they don't give or take e-

Are always + because the lose e- in ionic compounds

• Group 1A: All +1
• Group 2A: All +2
• Group 3A:
•     Al +3
•     Ga +3
•     In +3/+1
•     Ti +3/+1
• Group 4A: Sn +4/+1    Pb +4/+1
• Group 5A: Bi +5/+3

• TM's that form 2 or more cation
•     Chromium: Cr+2, Cr+3, Cr+6
• TM's that form one cation
•     Zn+2, Cd+2, Ag+1
• Look at nomenclature lab for the rest 12

The names are the same as the original element names but, if a metal can form more that one cation then you use Roman numerals in parenthese.

• - Cations lead the formula and the name
• - COmbine cations and anions in simple whole # ratios. The rations become subscripts i the formula
• - Prefixes never used for ionic compounds

Done