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Atomic Structure

Anions that contain more than one element
are called Compound Anions.

Below are common compounds that form anions
(negatively charged ions).
NO3-,   CO32-,   SO42-,   PO43-.
They are called
nitrate, carbonate, sulfate and phosphate.

In most chemical reactions that you will come across,
compound anions do not split up
but stay as a single species carrying a charge.

For example the Nitrogen and Oxygen in Nitrate (NO3)
usually stay together as if nitrate is just one thing
(click here for an example).

Examples of ionic compounds that have compound anions are

LiNO3, Mg(NO3)2,   lithium nitrate, magnesium nitrate,           
Na2CO3, CaCO3,    sodium carbonate, calcium carbonate,     
SO4, MgSO4,      potassium sulfate, magnesium sulfate,    
K3PO4, Ca3(PO4)2potassium phosphate, calcium phosphate.

The other common compound anion is hydroxide, (OH)-.
See acids and alkalis.

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