Question

1. put a checkmark next to the description if it describes an element, compound, or both.

both element compound
it has one chemical symbol.
its chemical formula can include different chemical symbols.
it is made of bonded atoms.
it is considered a pure substance.

Explanation:

Step1: Recall element definition

An element is a pure - substance made of only one type of atom and has one chemical symbol. So, “It has one chemical symbol” describes an element.

Step2: Recall compound definition

A compound is a pure - substance made of two or more different types of atoms bonded together and its chemical formula can include different chemical symbols. So, “Its chemical formula can include different chemical symbols” and “It is made of bonded atoms” describe a compound.

Step3: Recall pure - substance concept

Both elements and compounds are pure substances. So, “It is considered a pure substance” describes both.

Answer:

It has one chemical symbol: Element
Its chemical formula can include different chemical symbols: Compound
It is made of bonded atoms: Compound
It is considered a pure substance: Both