15:18

Tin - Periodic Table of Videos

12:59

Francium - Periodic Table of Videos

14:35

Hafnium - Periodic Table of Videos

13:19

Indium - Periodic Table of Videos

12:44

Ytterbium - Periodic Table of Videos

11:49

Yttrium - Periodic Table of Videos

9:27

Niobium - Periodic Table of Videos

22:43

Tungsten (new) - Periodic Table of Videos