Anions
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Anions

Names

Next let's deal with the nonmetals.  They gain electrons to become anions.

The halogens - fluorine, chlorine, bromine, and iodine - become anions with a negative one charge. To name these negatively charged ions we change the ending of the name of the element to "-ide" - fluoride, chloride, bromide and iodide ions.

Oxygen, sulfur, and the other nonmetallic elements in that family will gain two electrons. The names of these negative ions also have an "-ide" ending - oxide, sulfide, selenide, telluride ions.

In the next group over, nitrogen, phosphorus and arsenic can take on three electrons to become nitride, phosphide and arsenide ions.

Periodic table - nonmetal portion showing charges for anions.

We learned that carbon does not have a strong enough attraction for electrons to become a carbide ion by gaining four electrons.  We also learned that hydrogen will sometimes gain one electron to become a hydride ion with a negative one charge.

Practice with Names of Anions

Take time now to get some practice with anions by working on the following exercise (also shown in your workbook in exercise 4). Check your answers on the following page or with the instructor.

Nonmetal Anion
Formula
Anion
Name
N    
O    
S    
Cl    
Br    

 

Answers

 

Nonmetal Anion
Formula
Anion
Name
N N3- nitride ion
O O2- oxide ion
S S2- sulfide ion
Cl Cl- chloride ion
Br Br- bromide ion

 

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E-mail instructor: Eden Francis

Clackamas Community College
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