Question

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

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.

Step2: Recall compound definition

A compound is a pure - substance made of two or more different types of atoms chemically bonded together, and its chemical formula has different chemical symbols.

Step3: Analyze "It has one chemical symbol"

This describes an element only.

Step4: Analyze "Its chemical formula can include different chemical symbols"

This describes a compound only.

Step5: Analyze "It is made of bonded atoms"

This describes a compound only as elements are single - type atoms (not bonded to different types in the context of this question).

Step6: Analyze "It is considered a pure substance"

Both elements and compounds are pure substances.

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