If Neon atom has 10 protons and 12 neutrons, what would be this
Atom's mass number?

H,   Z=10   the element is not fluorine, and its not sodium.

Explanation:

If you are doing your chemistry homework, you must have a Periodic Table beside you. You will also be supplied a Periodic Table in every test in Chemistry and Physics you will ever sit. So get your Periodic table, and consider the following. It has 10 electrons, 10 fundamental negative charges. Since the element is neutral, it has 10 fundamental positive charges, 10 protons, in its nucleus. In the nucleus there are also 12 massive, neutral particles, 12 neutrons. The number of protons,  Z, defines the atomic number, and the Periodic Table is arranged according to  Z.

.

b..

is the correct one

explanation:

covalent bonds form as valence electrons are shared between two atoms. lewis structures and structural formulas are common ways of showing the covalent bonding in organic molecules. formal charge describes the changes in the number of valence electrons as an atom becomes bonded into a molecule.

b.false that your answer