Oxidation numbers rules

Question 1

What is the oxidation state of an element

Answer 1

0

Question 2

What is the oxidation state of group 1 atoms

Answer 2

+1

Question 3

What is the oxidation state of group 2 atoms

Answer 3

2+

Question 4

What is the oxidation state of Hydrogen in a compound

Answer 4

+1

Question 5

What is the exception for the oxidation state of Hydrogen

Answer 5

Metal hydrides, where the OS is 0

Question 6

What is the oxidation state of Oxygen

Answer 6

-2

Question 7

What are the exceptions for the oxidation state of oxygen

Answer 7

Peroxides, (-O-O- group, where the OS is +1)

and O-F bonds (oxygen bonded to fluorine) where the OS becomes positive (no specific value as it varies in different compounds)

Question 8

What is the oxidation state of group 17 (halides) in a compound

Answer 8

-1

Question 9

What is the exception for the oxidation state of group 17 compounds

Answer 9

Cl, Br, I, bonded to oxygen where the oxidation state becomes positive (no exact value as it varies)