Hydrogen forms compounds with C,N,O, and F that have formulas CH4, NH3,H2O, and H. Predict the formulas hydrogen forms with P,Cl ,Si , and S.

Question

Hydrogen forms compounds with C,N,O, and F that have formulas CH4, NH3,H2O, and H. Predict the formulas hydrogen forms with P,Cl ,Si , and S.

Answer 1

Consider the organization of the periodic table.  Elements in a given column will often form compounds of similar formula.    In your example, P is below N in the periodic table.  N forms NH₃.  It is likely that P also forms PH₃.