An element from the periodic table is shown below. How many protons, neutrons, and electrons would a neutral atom of oxygen have?

Note: Round 15.999 up to 16.

The image is the Periodic table entry for Oxygen.
A
It has 8 protons, but the number of electrons and neutrons are unknown.

B
It has 8 protons, 8 electrons, and 16 neutrons.

C
It has 8 electrons and 8 neutrons, but the number of protons are unknown.

D
It has 8 protons, 8 electrons, and 8 neutrons.

The correct answer is B. An atom of oxygen has 8 protons (the atomic number), 8 electrons (since atoms are neutral and have the same number of protons and electrons), and 16 neutrons (the atomic mass rounded up).