Upload
kerry-holt
View
235
Download
3
Tags:
Embed Size (px)
Citation preview
Naming Compounds Involving Transition Metals
and Polyatomic Ions
Transition Metals
• The transition metals and the metals to the right of them generally form more than one ion. We call these elements multivalent.
• The charges on the multivalent elements' ions are not always predictable, although some patterns do exist.
• Consequently, you won't be expected to predict these, although you will be expected to work with them.
Ionic Compounds Involving Transition Metals
• Roman numerals are used in the name of the transition metal in the compound to show the valence on the cation.
• Examples:• Mn+4 = Manganese(IV) OR Mn+5 =
Manganese(VI)• Fe+2 = Iron(II) OR Fe Iron(III)• Cu+1 = Copper(I) OR Cu+2 = Copper(II)
Examples of Transition Metals
• Iron(II)• Iron(III)• Copper(I)• Copper(II)• Manganese(II)• Manganese(IV)
• Fe +2
• Fe +3
• Cu+1
• Cu+2
• Mn+2
• Mn+4
Steps to Naming the Ionic Compounds1. Separate the two elements-metal and non-metal2. Add 1’s with the element that has no number3. Cross-over from bottom to top4. Add the charges-REMEMBER the first one (metal) is positive and the second (non-metal) is negative5. Make sure the charges match those found on the Periodic Table
**If they do not , MULTIPLY both charges with the same number to find the non-metals true charge.
6. Write the name-the metal stays the same, but the non-metal changes it’s ending to “ide”.
Let’s Practice!
• Name the ionic compound for Fe2O3
• PbO2
Special Cations
Steps to Writing Chemical Formulas
1. Determine the metal and non-metal**Hint-the element with the roman numeral is the metal
2. Write the charges-Look at the roman numeral for the metal’s charge- Look at the Periodic Table for the non-metal’s charge
3. Cross over from top to bottom4. Remove the charge and make each number a subscript5. Simplify the numbers6. Remove any 1’s7. Rewrite using the element symbol and include the subscript
Let’s practice!
• Manganese (IV) Oxide
• Copper(II) phosphide
Polyatomic Ions
• Polyatomic (many atom) ions are covalent molecules with a charge. They behave as if they were a one-atom ion.
??
Naming Compounds Involving Polyatomic Ions
• Polyatomic Ions can form ionic or covalent bonds.
• The polyatomic ion is always listed second.• You DO NOT use the ending “ide”