Rare elements

We had 19*7=133 students who started this course. They are organized in ../../rare elements and will work together on some projects. Each group sent some graphics. We instructors have voted and Neodynmium emerged as the winner. Click to get a large version:
Actinium Cerium Dysprosium Erbium Europium Gadolinium Holmium Lanthanum Lutetium
Neodymium Praseodymium Promethium Samarium Scandium Terbium Thorium Thulium Ytterbium Yttrium
We also learn a bit about ../../rare elements, an exciting and maybe less known part of chemistry : 
Scandium      Group 21        Yttrium       Group 39
Lanthanum     Group 57        Cerium        Group 58
Praseodymium  Group 59        Neodymium     Group 60
Promethium    Group 61        Samarium      Group 62
Europium      Group 63        Gadolinium    Group 64
Terbium       Group 65        Dysprosium    Group 66
Holmium       Group 67        Erbium        Group 68
Thulium       Group 69        Ytterbium     Group 70
Lutetium      Group 71        Actinium      Group 89
Thorium       Group 90