Question

a is made up of atoms that are chemically combined in like nacl or h₂o. if the atoms share electrons in a the compound can is a.

Explanation:

A compound is made up of atoms chemically - combined. Atoms in a compound are in a definite proportion. When atoms share electrons, they form a covalent bond, and the resulting compound can be a molecule.

Answer:

A. compound
B. definite proportion
C. covalent bond
D. molecule