element Q forms compounds with the element X and with element Z write the formulas for these 2 compounds?

Answer 1

There isn't enough information to write the formulas for any of the compounds formed.QX and QZ is the best I can do; however, we don't know the valencies so we don't know how many of the Q adds to X or Z.
We could write Q_aX_b or Q_cZ_d where a,b,c, and d are small whole numbers.

Answer 2

QX and QZ