Binary Ionic Compounds: Transition Metals Science 10 Chemistry Unit

Multivalent Ions We are going to learn how to name binary ionic compounds where the metals (or cations) can form more than one ion… multi- valent ions. We are going to learn how to name binary ionic compounds where the metals (or cations) can form more than one ion… multi- valent ions. These multivalent ions are usually transition metals and can usually be found in Groups These multivalent ions are usually transition metals and can usually be found in Groups Examples : Iron and Cobalt…Symbol & Charge?

Stock System The method we will use is The method we will use is called the Stock System Named after Alfred Stock Named after Alfred Stock ( ), a German chemist. We use Roman Numerals We use Roman Numerals to represent the charge of the multivalent ion. Roman Numerals 1I 2II 3III 4IV 5V 6VI 7VII 8VIII 9IX 10X

Problem 1: Problem 1: Write the name of FeCl 2 Write the name of the cation … but iron has more than one choice…which one will we use? Write the name of the cation … but iron has more than one choice…which one will we use? Look at the charge of the anion and also look at the subscript. Look at the charge of the anion and also look at the subscript.

Does the cation have a subscript ? Does the cation have a subscript ? Use Roman Numerals to identify the charge of the cation. The value of the Roman number equals the positive charge on the cation. Use Roman Numerals to identify the charge of the cation. The value of the Roman number equals the positive charge on the cation. Write the name of the anion with an " ide." Write the name of the anion with an " ide."

Try naming these compounds: 1.CuCl 2 2.Fe 2 O 3 3.SnO

Problem 2: Problem 2: Write the formula for copper (II) chloride Write the symbol of the metal ion. The Roman numeral WILL tell you the charge on the cation. In this case it is a positive two. Write the symbol of the metal ion. The Roman numeral WILL tell you the charge on the cation. In this case it is a positive two. Write the symbol of the anion and charge. Write the symbol of the anion and charge. Remember the rule that a formula must have a net or overall charge of zero… you can cross multiply. Remember the rule that a formula must have a net or overall charge of zero… you can cross multiply. The formula is The formula is

Write the formula for these compounds: 1.copper (I) oxide 2.iron (III) sulfide 3.tin (IV) phosphide

Important Note: Do not use prefixes …they are for molecular or covalent compounds (two non-metals or metalloids) Do not use prefixes …they are for molecular or covalent compounds (two non-metals or metalloids)

Write the correct name or formula for the following: 1.CuS _____________________________ 2.PbBr 4 _____________________________ 3.Pb 3 N 2 _____________________________ 4.Fe 2 O 3 _____________________________ 5.FeI 2 _____________________________ 6.Sn 3 P 4 _____________________________ 7.Cu 2 S_____________________________

Write the correct name or formula for the following: 1.SnCl 2 _____________________________ 2.HgO_____________________________ 3.Iron (II) chloride ____________________________ 4.Copper (I) sulfide ____________________________ 5.Lead (IV) iodide ____________________________ 6.Tin (II) fluoride _____________________________ 7.Mercury (I) bromide _________________________ 8.Tin (II) oxide ____________________________ 9.Chromium (III) oxide__________________________