# Can you determine whether a compound can form given particular elements?

Say you are given a set of particular elements, such as Dy, C, I, Er, P. Is it possible to determine whether a compound exists with all of the given elements and no more?

If not, is it possible to find this out if given the number of a particular element, such as; two hydrogen and one oxygen where you could come to the conclusion that $\ce{H2O}$ is possible.

• are you sure about Dy, Er? – triclosan Jul 18 '13 at 21:08

1. Consider this short list C, H, O, N this elements can produce unlimited number of compounds.