Spot the one that does not fit

Exercise and reference answers

Questions

1. Items

   1. Nitrogen
   2. Carbon monoxide
   3. Hydrogen
   4. Nitrosyl ion

   Odd item

   Hydrogen

2. Items

   1. Head-on
   2. Axial
   3. Sidewise
   4. Sigma

   Odd item

   Sidewise

3. Items

   1. Octet
   2. Valence
   3. Lewis symbol
   4. Saucer

   Odd item

   Saucer

Instructions

Tap the item that does not belong with the rest.

Explanation