Final answer:
The formula for the compound formed from the elements q and z is q2z. Therefore, the correct option is B.
Step-by-step explanation:
The formula for the compound formed from the elements q and z is q2z (option b).
In chemistry, when two elements combine to form a compound, their symbols are written together without any numbers or subscripts between them. The numbers and subscripts are added if there is a need to balance the charges of the ions or atoms in the compound.
In this case, the compound formed from the elements q and z does not require any additional numbers or subscripts. Therefore, the correct formula is q2z.