Untitled Flashcard Set

Writing Chemical Formulae 

Common Ions 

+1 +2 +3 -3 -2 -1 

Li

+ 

Na

+ 

K

+

 

Ag

+

 

Mg

2+

 

Ca

2+

 

Zn

2+ 

Al

3+ 

N

3- 

O

2-

 

S

2- 

F

- 

Cl

-

 

Br

- 

I

- 

 

You will notice the link  between group number and type of ions formed.  

 

Transition metal ions 

Transition elements can form 

different positive ions

. To find out what type of positive 

ion we write a 

roman numeral

 between the metal and non-metal in the compound  

E.g.  Copper(I) oxide  =  Cu

2

O 

 Copper(II) oxide = CuO  

Copper(I)   =  Cu

+

 

Copper(II)   =  Cu

2+

 

 

 

Non-metal molecular ions 

These are groups of elements that together are either positively or negatively charged 

particles. 

Ammonium NH

4

+

    Sulphate  SO

4

2-

 

Nitrate  NO

3

-

    Hydroxide  OH

-

 

Carbonate CO

3

2-

    Phosphate  PO

4

3-

   

Sulphite SO

3

2-

    Hydrogencarbonate HCO

3

-

  

 

 

 

Questions