LT 4-7b - Using Transition Elements

LT 4-7a - Using Transition Elements in Naming and Formulas

​4-7a Review - Writing Names

1. ​Write the name of the metal first

2. Write the name of the nonmetal, but change the ending to -ide​

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​Example:

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Mg₃P₂ Magnesium phosphide

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Poll

What is the correct name for Li₂O?

• Dilithium Oxide

• Lithium Oxygen

• Lithium Oxide

• Dilithium oxygen

​4-7a Review - Writing Formulas

1. ​Write symbols of the elements

2. Write the charges of the elements​

3. Balance the charges (cross down)​

​Example:

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Sodium Nitride​

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Step 1: NaN

Step 2: Na⁺¹ N^-3

Step 3: Na₃N​

Poll

What is the correct formula for aluminum sulfide?

• AlS

• Al₃S₂

• Al_-2S₊₃

• Al₂S₃

​Using Transition Metals in Naming

• You can't look up the charges of transition metals, so you have to ​include the charge as a roman numeral in the name.

  The charge will go in parenthesis () after metal name​

​Roman numerals: I, II, III, IV, V, VI, VII

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​Steps:

1. ​Write the name of the metal

2. Find the char​ge

3. ​Write the name of the nonmetal with the ending ide

Example​

CuO Copper ( ) Oxide​

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Charges have to balance out, so we use the charge of oxygen to find the charge of copper​

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​Oxygen = -2 Since there's no subscripts, Cu must be +2 to

cancel out the -2

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​Name: Copper (II) oxide

​Example #2

Mn₂O₇ Manganese ( ) oxide​

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This time there's subscripts. Remember, these subscripts are equal to the opposite element's charge​.

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So, the charge of manganese has to be +7​

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Manganese (VII) oxide

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Poll

What is the correct name of Ag₂O

• Silver (I) oxide

• Silver oxide

• Silver (II) oxide

• Silver (II) oxide (I)

Formulas with Transition Elements​

The charge is given to you in the name, so just use the charge given for the metal and look up the charge for the nonmetal

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Step 1: Write the element symbols

Step 2: ​Use the roman numeral number for the charge of the metal. Look up the nonmetal charge

Step 3: ​Cross down the numbers. Cancel numbers if they are the same

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​Example

Gold (III) chloride​

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Au = +3

Cl = -1

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​Au⁺³ Cl^-1 Cross numbers down

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Au​Cl₃

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Poll

What is the formula for chromium (III) oxide

• Cr₂O₃

• Cr₃O₂

• CrO

• Cr₃O