Overview

Many of the ions that have featured in this module are given in the context of the periodic table below.

• The -ate ions all have four oxygens except for nitrate and carbonate from the second row elements.
• Going from left to right for oxoanions in the same row, the charge decreases even though the number of oxygens stays the same
• Per- and hypo- prefixes where there are multiple oxoanions formed by the same element.

1 H

USE THE PATTERNS!!!

2 He

3 Li

4 Be

5 B

6 CO32– carbonate

7 NO3– nitrate NO2– nitrite

8 O

9 F

10 Ne

11 Na

12 Mg

13 Al

14 Si

15 PO43– phosphate

16 SO42– sulfate SO32– sulfite

17 ClO4– perchlorate ClO3– chlorate ClO2– chlorite ClO– hypochlorite

18 Ar

19 K

20 Ca

21 Sc

22 Ti

23  V

24 CrO42– chromate

25 MnO4– permanganate

26 Fe

27 Co

28 Ni

29 Cu

30 Zn

31 Ga

32 Ge

33 As

34 Se

35 Br

36 Kr

Oxoanions with charges of 2– or more negative also form hydrogen-containing ions.
The charge on these is a unit more positive for each hydrogen (the hydrogen is actually H⁺).