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Oxidation Numbers

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Oxidation Numbers

Each element wants to have 8 electrons in its outer energy shell. (8 valence electrons)

By adding or losing electrons though bonding.

When you know this, you know the oxidation number.

Oxidation number charge acquired by gaining or losing electrons to follow the octet rule.

Is it easier to lose or gain to get to 8…..

Remember that each energy level (when full) has 8

F

Ca

1s2 2s2 2p6 3s2 3p6 4s2

1s2 2s2 2p5

Ex:

Cl = -1 oxidation numberCl-1

Li = 1 as an oxidation number Li+1

As the number of electrons increases, then the energy required to get rid of the electrons increases.

(easier to get rid of one than 4….)

How many valence electrons can Hydrogen and Helium have?

What about Be, B, Li……