Spot the one that does not fit

Exercise and reference answers

Questions

1. Items

   1. Electron
   2. Proton
   3. Neutron
   4. Nucleon

   Odd item

   Electron

2. Items

   1. Thomson
   2. Rutherford
   3. Chadwick
   4. Newton

   Odd item

   Newton

3. Items

   1. Gold foil
   2. Alpha rays
   3. Rebounding
   4. Canal rays

   Odd item

   Canal rays

4. Items

   1. K shell
   2. L shell
   3. M shell
   4. Z number

   Odd item

   Z number

Instructions

Tap the item that does not belong with the rest.

Explanation