Spot the one that does not fit

Exercise and reference answers

Questions

1. Items

   1. Moseley
   2. Dobereiner
   3. Newlands
   4. Mendeleev

   Odd item

   Moseley

2. Items

   1. s-block
   2. Noble gas
   3. p-block
   4. d-block

   Odd item

   Noble gas

3. Items

   1. Triads
   2. Octaves
   3. X-ray plot
   4. Table gaps

   Odd item

   X-ray plot

4. Items

   1. Reactive metal
   2. Low ionization
   3. Forms 1+ ion
   4. Coloured ions

   Odd item

   Coloured ions

Instructions

Tap the item that does not belong with the rest.

Explanation