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Multiple atoms on the left side form a polyatomic ion.

Click the item that fits on the right side of the formula.

Naming Inorganic Compounds:  Try a new formula

Click here to see the Legend. See also: typical oxidation numbers

  

Facts about Polyatomic Combinations:

Most polyatomic ions act like non-metals (negative charges) and form ionic compounds with metals. In that case change the positioning within the formula as follows:

.

When the polyatomic ion is positively charged (for ex. NH4+) then it appears on the left side of the formula as follows:

.

 

Polyatomic combinations with brackets and multiple instances such as these

    and 

do not contribute Greek Numerals to the polyatomic part of the name, regardless if they act like a metal or non-metal.

Examples:

(NH4)2S   Ammonium Sulfide  
Sr(H2PO4)2   Strontium Dihydrogen Phosphate  
Ca2(NO3)2   Calcium Nitrate  

 

See polyatomic examples #1.

See polyatomic examples #2.

 

On its own,can be any of the following combinations:

polyatomic examples #3 (Table P1.6)

or oxyanions 

 

 

 

See your Alberta Chemistry 20 Textbook pdf.

Read the "Names and Formulas for Binary Compounds" section on page 10 or see the theory here.

 

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