Spot the one that does not fit

Exercise and reference answers

Questions

1. Items

   1. Fluorine
   2. Oxygen
   3. Sulphur
   4. Selenium

   Odd item

   Fluorine

2. Items

   1. Helium
   2. Neon
   3. Argon
   4. Chlorine

   Odd item

   Chlorine

3. Items

   1. Pale blue gas
   2. Has a smell
   3. Blocks UV rays
   4. Odourless gas

   Odd item

   Odourless gas

4. Items

   1. Astatine
   2. Tennessine
   3. Radioactive
   4. Argon gas

   Odd item

   Argon gas

Instructions

Tap the item that does not belong with the rest.

Explanation