An atom of oxygen has an atomic number of 8 and a mass number of 18. How many of each type of subatomic particle does it contain?

8 protons

8 electrons

10 neutrons

Explanation:

The structure of an atom is made up of protons in the middle (nucleus) followed by neutrons surrounding the nucleus, and in the outer orbit you find the electrons. To obtain the subatomic particle number of an atom, we calculate the atomic number and the mass number of the said atom.

8 protons, 8 electrons, 10 neutrons