They are transition metals.
groups run top to bottom periods run left to right
The melting point of gadolinium is: 1 312 0C.
Any element that is in one of the representative elemenet groups is a representative element. A representative element group is any of the groups 1-2, 13-18, i.e. not a transition metal. So, a representative element is an element that isn't a transition metal.
Element groups
Periodic table has 18 groups; see the link below.
312.
312 mm is equal to .312 meters.
1,2,3,4,6,8,12,13,24,26,39,52,78,104,156,and 312.
312
312
312 12*26 = 312 13*24 = 312
312% of 213= 312% * 213= 3.12 * 213= 664.56