Chemistry A-Level
Oxidation Number (State)
What Oxidation Number (State) means in Chemistry A-Level, as defined for Pearson Edexcel.
Definition of Oxidation Number (State)
A number assigned to an element in chemical combination that represents the number of electrons lost or gained by an atom of that element in the compound.
Topics that use Oxidation Number (State)
- Topic 3: Redox I (Pearson Edexcel A-Level)
Related terms
Using Oxidation Number (State) in the exam
Definition questions usually carry one or two marks, and examiners look for the precise wording. Write the definition from memory, check it against the version above, and then use the term in a longer answer on the same topic so it sticks.
Practise Chemistry questions
Create a free account to answer exam-style questions on this topic and get feedback on your answers.
Start free
All Chemistry A-Level terms7 days Premium · Then free forever · No card, no charge