One of the most common elements is Oxygen.

What are some of the characteristics of Oxygen: the atomic number, the atomic mass, the number of protons, the number of neutrons, how many valence electrons and how many energy shells?

Explanation:

- The atomic number of Oxygen is 8.

- The relative atomic mass is approximately 16.

- It has 8 number of protons.

- It has  8 number of neutrons ( Atomic Mass - number of protons).

- Oxygen has 6 valence electrons.

- It has 2 energy shells, two electrons occupy the first energy shell while six    electrons occupy the second energy shell.