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Polyatomic Ions

Ashley Hinton

Created on November 8, 2024

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Transcript

Bonding and Polyatomic Ions

What is a polyatomic Ion?

Pre-bonded compounds that are not neutral.

You may not take them apart!

Charge of the PAI

They are all pre-named for you.Use the PAI sheet to find them.

How are they used?

1. Can be mixed with any element.

2. Must still be combine to make a neutral compound. 3. Same naming rules apply for the element they are with.

Transition metals still need roman numerals!
Aluminum Nitrate
Name the compound.

Use parenthesis when you need more than one PAI.

Parentheses only go around the PAI.

Example: Magnesium Hydroxide

Mg(OH)2

Example: Chromium (III) Phosphate

CrPO4

Example: Aluminum Acetate

Al(C2H3O2)

Practice Problems

Writing formulas for PAI compounds

Mg(MnO4)2

Magnesium Permanganate

1. Look to see if there is a transition metal. 2. Write the name of the metal and roman numeral (if needed). 3. Write the name of the PAI.

Find the formula! 1. Find charge of metal. 2. Find PAI. 3. Decide how to make the compound = Zero. 4. Add atoms if needed. (maybe parethesis?) 5. Double check that you = zero!!

Practice problems

Check for Transition metals!

Example: TiSO3

Titanium (II) Sulfite

Example: B(BrO3)3

Boron Bromate

Example: (NH4)2S

Ammonium Sulfide