Binary Ionic Compounds: Binary Ionic Compounds: Transition MetalsTransition Metals

Science 10Science 10Chemistry UnitChemistry Unit

Multivalent IonsMultivalent Ions We are going to learn how to name We are going to learn how to name binary ionic compoundsbinary ionic compounds where the where the

metals (or cations) can form more than one ion…metals (or cations) can form more than one ion…multi-valent ionsmulti-valent ions. .

These These multivalent ionsmultivalent ions are usually transition metals are usually transition metals and can usually and can usually be found in be found in Groups 3-12Groups 3-12..ExamplesExamples: Iron and Cobalt…Symbol & Charge?: Iron and Cobalt…Symbol & Charge?

Stock SystemStock System The method we will use is The method we will use is

called the called the Stock SystemStock System Named after Named after Alfred StockAlfred Stock

(1876-1946), a German (1876-1946), a German chemist.chemist.

We use We use Roman NumeralsRoman Numerals to represent the to represent the chargecharge of of the the multivalentmultivalent ion. ion.

Roman Numerals

1 I

2 II

3 III

4 IV

5 V

6 VI

7 VII

8 VIII

9 IX

10 X

Problem 1:Problem 1: Write the name of FeCl2 Write the Write the namename of the of the cationcation … but iron has … but iron has

moremore than one choice…which one will we than one choice…which one will we use? use?

Look at the Look at the chargecharge of the of the anionanion and also and also look at the look at the subscriptsubscript. .

Does the Does the cationcation have a have a subscriptsubscript? ?

Use Use Roman NumeralsRoman Numerals to identify the charge of the to identify the charge of the cation. The value of the Roman number equals the cation. The value of the Roman number equals the positive charge on the positive charge on the cationcation..

Write the name of the Write the name of the anionanion with an " with an "ideide."."

Try naming these compounds:Try naming these compounds:

1.1. CuClCuCl22

2.2. FeFe22OO33

3.3. SnOSnO

Problem 2:Problem 2: Write the formula for copper (II) chloride Write the Write the symbolsymbol of the metal ion. The Roman numeral of the metal ion. The Roman numeral

WILLWILL tell you the tell you the chargecharge on the cation. In this case it is a on the cation. In this case it is a positive two.positive two.

Write the Write the symbolsymbol of the anion and charge. of the anion and charge.

Remember the rule that a formula must have a Remember the rule that a formula must have a netnet or or overall chargeoverall charge of zeroof zero… … you can cross multiply.you can cross multiply.

The formula isThe formula is

Write the formula for these compounds:Write the formula for these compounds: 1.1. copper (I) oxidecopper (I) oxide

2.2. iron (III) sulfideiron (III) sulfide

3.3. tin (IV) phosphidetin (IV) phosphide

Important Note:Important Note:

Do Do notnot use use prefixesprefixes…they are for …they are for molecularmolecular or or covalentcovalent compounds (two non-metals or compounds (two non-metals or metalloids)metalloids)

Write the correct name or formula for the following: 1.1. CuS _____________________________CuS _____________________________

2.2. PbBrPbBr44__________________________________________________________

3.3. PbPb33NN22__________________________________________________________

4.4. FeFe22OO33__________________________________________________________

5.5. FeIFeI22__________________________________________________________

6.6. SnSn33PP44__________________________________________________________

7.7. CuCu22S_____________________________S_____________________________

Write the correct name or formula for the following: 1.1. SnClSnCl22__________________________________________________________

2.2. HgO_____________________________HgO_____________________________

3.3. Iron (II) chloride ____________________________Iron (II) chloride ____________________________

4.4. Copper (I) sulfide ____________________________Copper (I) sulfide ____________________________

5.5. Lead (IV) iodide ____________________________Lead (IV) iodide ____________________________

6.6. Tin (II) fluoride _____________________________Tin (II) fluoride _____________________________

7.7. Mercury (I) bromide _________________________Mercury (I) bromide _________________________

8.8. Tin (II) oxide ____________________________Tin (II) oxide ____________________________

9.9. Chromium (III) oxide__________________________Chromium (III) oxide__________________________