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.

well in order to answer this question you have to provide more information < 3

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."