Question

question 4
what is the best definition of a compound?
a substance with two or more of the same atoms bonded together
a chemical substance
a connection between a positive ion and a negative ion
a substance with two or more different atom types bonded together

Explanation:

A compound is defined as a substance made up of two or more different types of atoms chemically bonded together. A substance with the same atoms bonded is an element, a chemical substance is a broad - term, and a connection between positive and negative ions is an ionic bond but not the definition of a compound.

Answer:

A substance with two or more different atom types bonded together