What elements will combine with chlorine in a 1 to 2 ratio to give a formula of X Cl 2?

Chlorine being as reactive as it is, any element with two bonding sites will do that.

These are elements having the valence two: Ba, Ca, Zn, Fe, Mg etc.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.