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What is the oxidation number

Exercise and reference answers

Items
  1. Item
    A free element
    Category
    Zero
  2. Item
    Uncombined atom
    Category
    Zero
  3. Item
    Hydrogen usually
    Category
    Plus one
  4. Item
    Alkali metals
    Category
    Plus one
  5. Item
    A one atom ion
    Category
    The ion charge
  6. Item
    Monatomic ion
    Category
    The ion charge
Categories
  1. Item
    Zero
  2. Item
    Plus one
  3. Item
    The ion charge
Instructions
Tap each case into the oxidation number it takes.

Explanation

_Source: syllabus Chemistry Part II, Ch 7 'Redox Reactions'_
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