Chapter 4: Oxidation Number Rules

Question 1

What is the oxidation number for hydrogen in METALS

Answer 1

-1

Question 2

What is the oxidation number for polyatomic IONS

Answer 2

= to the ion’s charge

Question 3

What is the oxidation number for Group 3A ions in compounds (like the Al3+ in Al(NO3)3

Answer 3

Oxi number is equal to the charge; +3

Question 4

What is the oxidation number of neutral compounds

Answer 4

0

Question 5

What is the oxidation Number for atoms in their elemental form?

Answer 5

0

Question 6

What is the oxidation number for Monatomic Ion (one element with a charge like K+)

Answer 6

Oxi number equals the ion’s charge

Question 7

What is the oxidation number for Group 1A ions in compounds (like the Na+ from NaCl)

Answer 7

Oxi number is equal to the charge; +1

Question 8

What is the oxidation number for fluorine in compounds

Answer 8

-1

Question 9

What is the oxidation number for the oxygen in peroxides

Answer 9

Each of the 2 oxygens has an oxi number of -1.

Question 10

What is the oxidation number for group 7A ions in most binary compounds

Answer 10

-1 except with oxygen

With oxygen, they can be positive

Question 11

What is the oxidation number for Group 2A ions (like the Ca2+ in CaCl2)

Answer 11

Oxi number is equal to the charge; +2

Question 12

What is the oxidation number for oxygen in molecular and ionic compounds

Answer 12

Usually -2 EXCEPT in peroxides

Question 13

What is the oxidation number for hydrogen in NON metals

Answer 13

+1