How can I find the melting point of a sudstance?
the best way I know is to use a hotplate with a gradient of different temperatures with said temperatures marked on the side. You move the substance along it until it melts.
If you dont have access to something like this (I've only used them in chemistry labs at uni) maybe just heat it up with a thermometre?
Well, you can melt it and find out.
You can also go here and click on the element in question for an analysis: http://www.chemicalelements.com/
heat it up to melt even more to boil