Spot the one that does not fit

Exercise and reference answers

Questions

1. Items

   1. Lanthanoids
   2. 3d series
   3. 4d series
   4. 5d series

   Odd item

   Lanthanoids

2. Items

   1. Coloured ions
   2. Variable states
   3. Full d subshell
   4. Forms complexes

   Odd item

   Full d subshell

3. Items

   1. Zinc
   2. Cadmium
   3. Mercury
   4. Scandium

   Odd item

   Scandium

4. Items

   1. Zr 160 pm
   2. Hf 159 pm
   3. Similar radii
   4. Wide apart

   Odd item

   Wide apart

Instructions

Tap the item that does not belong with the rest.

Explanation