Oxidation Number Rules Flashcards Preview

Gen Chem 01 > Oxidation Number Rules > Flashcards

Flashcards in Oxidation Number Rules Deck (11):
1

Free (uncombined) elements

Free (uncombined) elements have an oxidation number of zero

This includes polyatomic elements

2

Monatomic ions

Monatomic ions:
Oxidation number = charge of ion

3

Oxygen

Oxygen:

Usually -2

Exceptions:
Hydrogen peroxide: H2O2 (-1)
Peroxide ion: O22- (-1)

4

Hydrogen

Hydrogen:

Oxidation = +1

Except when bound to metals in binary compounds (-1)

5

Group 1A

Group 1A:

+1

6

Group 2A

Group 2A:

+2

7

Al (Group 3A)

Al (Group 3A):

+3

8

F (Group 7A)

F (Group 7A):

-1

9

Molecular formula or formula unit

Molecular formula or formula unit:

Oxidation number sum must equal zero

10

Polyatomic ions

Polyatomic ions:

Sum of oxidation numbers must = ion charge

11

Oxidation numbers

Can be integers or fractions

E.g. one O in O2- = -1/2