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January 15, 2014 Brain Bender. What does the prefix “poly” mean? Considering that, what do you think a polyatomic ion is?. Naming Ionic Compounds with Polyatomic Ions. Complex Ionic Compounds. Polyatomic Ions:. “Poly” – many/multiple/more than one

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January 15 2014 brain bender
January 15, 2014Brain Bender

What does the prefix “poly” mean? Considering that, what do you think a polyatomic ion is?



Polyatomic ions
Polyatomic Ions:

  • “Poly” – many/multiple/more than one

  • Polyatomic ions – ions that are made up with more than one atom

    Examples: NO3-1 SO4-2 MnO4-1 C2H3O2-1

    _These are compounds that act just like an individual element


Complex ionic compounds
Complex Ionic Compounds

Any ionic compound that contains three or more elements.

It can ONLY occur if there is a polyatomic ion present in the compound.



Let s practice
Let’s Practice:

  • Identify the compounds with polyatomic ions:

    • Hint: Look for 3 or more different atoms in the compound.


Rules for naming complex ionic compounds
Rules for naming Complex Ionic Compounds:

  • Name the first element directly off the periodic table, IF IT IS A METAL

    *Remember to identify the charge of any transition metal using roman numerals

  • Name the second element, IF IT IS A NONMETAL, by changing the ending to -ide

  • If either of the elements is a polyatomic, name it directly off the polyatomic list, replacing step 1 or 2.

    Na2CO3

    Sodium Carbonate


Naming complex ionic compounds
Naming Complex Ionic Compounds:

  • Name the first element directly off the periodic table, IF IT IS A METAL

    *Remember to identify the charge of any transition metal using roman numerals

  • Name the second element, IF IT IS A NONMETAL, by changing the ending to -ide

  • If either of the elements is a polyatomic, name it directly off the polyatomic list, replacing step 1 or 2.

    NH4Cl

    Ammonium Chloride


Naming complex ionic compounds1
Naming Complex Ionic Compounds:

When we need multiple polyatomic ions to create a neutral compound, ( ) are used around the polyatomic ion.

The subscript is placed OUTSIDE of the ( )

The polyatomic ion MUST be treated as ONE atom….it is a unit that CANNOT be separated.

Ca+2 ClO3-1

Ca(ClO3)2

Calcium Chlorate



Rules for writing compound formulas
Rules for writing compound formulas:

Write out the ions for each of the elements/polyatomic present

Write the charge with each ion present

Drop the signs (+/-)

Swap the numbers

Simplify if necessary

Sodium Phosphate

Na+1 PO4-3

Na3PO4


Here s another example
Here’s another example:

Write out the ions for each of the elements/polyatomic present

Write the charge with each ion present

Drop the signs (+/-)

Swap the numbers

Simplify if necessary

Aluminum Carbonate

Al+3 CO3-2

Al2(CO3)3



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