Answer:
an element with an atomic number of 8 and an atomic mass of 16 has 8 protons.
Explanation:
An element with an atomic number of 8 has 8 protons. The atomic number of an element is the number of protons in its nucleus. The atomic mass is the sum of the number of protons and neutrons in the nucleus. In this case, the atomic mass is 16, so the element must have 8 neutrons.
To answer your question directly, an element with an atomic number of 8 and an atomic mass of 16 has 8 protons.