Here is a good site that will give you all of the information you seek. Study it carefully.
http://chemed.chem.purdue.edu/demos/main_pages/2.2.html
How do the physical properties of nonmetals differ from the physical properties of metals?
3 answers
Which group of elements are all gases at room temperature?
Look at group 18 or the periodic table.
http://www.webelements.com/
http://www.webelements.com/