CljjO cio2 ci3o7

Figure 2.2!

Multiple oxidation states of chlorine due to sharing of electrons. Chlorine forms similar compounds in all states of oxidation from +1 to +7, except for +6.

Table 2.21 Oxidation numbers (valences) of some important elements

Element

Most comiiiiiii oxidation numbers (valences)

Fixed

0

-2,0

H

+ 1,0

Ca, Mg

+2,0

K, Na

+ 1,0

Variable

N

+5, +4, +3, +2, +1,0,-3

Cl

+7, +5, +4, +3, +1,0,-1

Mn

+7, +6, +4, +3, +2,0

S

+6, +4, +2,0, ~2

Fe

+3, +2,0

Cu

+2, +1,0

Cr

+6, +3,0

C

+4, +3, +2, +1,0, -1, -2, -3, -4-

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