Respuesta :

D. compounds

A compound is a substance formed when two or more chemical elements are chemically bonded together. The elements in any compound are always present in fixed ratios.

Answer:

D. Compounds

Explanation:

Compounds are the substances made of two or more different elements. The atoms form the compounds to gain the stable form. Some of the examples of compounds are H2O (water), NaCl (sodium chloride), CO (carbon monoxide) etc.  

Element of each atom in a compound has its octet completed which in turn imparts stability to the compound.