Three or four oxygens, charge decreases across the row

The first step is learning the formulae and charges for the ions shown in the periodic table below.
The name of each of these has an -ate suffix .
Each ion is shown at the position in the periodic table occupied by its central atom.

• 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
• The "per" prefix is used in some cases because as will be revealed later there is more than one oxoanion for that element.

1 H

These are arranged by element in the periodic table to highlight trends.

2 He

3 Li

4 Be

5 B

6 CO32– carbonate

7 NO3– nitrate

8 O

9 F

10 Ne

11 Na

12 Mg

13 Al

14 Si

15 PO43– phosphate

16 SO42– sulfate

17 ClO4– perchlorate

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