oh yeah which one heviest element out of the first 5 of family 1, first 4 of family 2, 13, 14, and 18. The first 3 of families 15-17
Go to this web site that has a periodic table with 18 labelled columns:
http://www.webelements.com/
You can read off the answers there yourself. The answer to your first question, for family 1 (the left hand column), is Rb (rubidium)