Fill the gaps on oxidation numbers

Exercise and reference answers

Missing parts

1. Answer

   zero

   Choices

   1. zero
   2. one
   3. two

2. Answer

   one

   Choices

   1. one
   2. two
   3. three

3. Answer

   two

   Choices

   1. two
   2. one
   3. four

4. Answer

   zero

   Choices

   1. zero
   2. one
   3. two

Complete the statement

A free element scores {0}. An alkali metal scores plus {1}. Oxygen usually scores minus {2}. In a neutral compound the numbers sum to {3}.

Instructions

Tap a word or figure to drop it into the slot.

Explanation