Question

Which of the following is true of oxygen?

A. Oxygen is an element because its most basic unit is a single type of atom.
B. Oxygen is a compound because its most basic unit is a single type of atom.
C. Oxygen is a mixture because its most basic unit contains more than one particle.
D. Oxygen is a compound because its most basic unit contains more than one type of particle.

Answer 1

A. Oxygen is an element because its most basic unit is a single type of atom.

Step-by-step explanation:

Oxygen is the chemical element with the symbol O and atomic number 8.