Chemistry Elements: a-h, Compounds, Cations, Gaseous Molecules

[chawki]

Homework Statement

Consider the elements marked with letters from a to h. Give the answer using these letters

Homework Equations

a) Give all of them which do not form compounds?
b) Give all of them which form cations with charge 2+?
c) Give all of them which form a gaseous molecule under normal conditions?

The Attempt at a Solution

a) a,b and c.
b) i don't know how to answer this even if i had the table infront of me, maybe you can give advise!
c) h,f

 

[chawki]

Where are you people...

 

[chawki]

b) b

 

[Borek]

First of all - find a periodic table and decode the elements. Then look for their properties and compare them with those given in the questions. This question is not more difficult than consulting your book or wikipedia.