Table of ON

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  OXIDATION NUMBERS

In the oxoacids

+1 +2

H+1 or H–1

+3

 

+4

 

 

 

+5

+3

 

 

+6

+4

 

+7

+5

+3

+1

Li

Na

K

Rb

Cs

 Be

Mg

Ca

Sr

Ba

B

Al

Ga

In

Tl

C

Si

Ge

Sn

Pb

N

P

As

Sb

Bi

O

S

Se

Te

F

Cl

Br

I

 

 

Sc+3                                  Zn+2

Y+3                          Ag+  Cd+2

La+3                                           

   –4 –3 –2 –1
With H and with the metals

 

The hydrogen (H) has oxidation number +1 with them nonmetals and 1 with the metals.

The fluorine (F) only has oxidation number 1.

The oxygen (O) has oxidation number -2, except in the peroxides where it is 1

The alkali metals (group 1, or group of the Li) have 1 electron in the last cap, tend to lose it, having always in the compounds oxidation number +1.

The alkaline earth metals (group 2, or group of the Be) have 2 electrons in the last cap, tend to lose them, having always in the compounds oxidation number +2.

The group of B (group 13) has 3 electrons in the last cap, they tend to lose them, having in the compounds oxidation number +3.

The group of C (group 14) has 4 electrons in the last cap, they tend to share them, have oxidation number +4 with the nonmetals, and oxidation number 4 with the metals and H.

The pnictogens (group 15, or group of N) has 5 electrons in the last cap, they tend to earn 3, having always with H and with the metals oxidation number 3.

The chalcogens (group 16, or group of O) have 6 electrons in the last cap, tend to earn 2, having always with H and with the metals oxidation number 2.

The halogens (group 17, or group of F) have 7 electrons in the last cap, tend to earn 1, having always with H and with the metals oxidation number 1.

In the transition metals the Ag has oxidation number +1, the Zn and the Cd have oxidation number +2, and the Sc, Y and La have oxidation number +3.

The groups 14 to 17 present several oxidation number when they form oxoacids, but they are studied later on.

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