I am having some chemistry problems.

3. The graph compares the 1s orbital energies for the F atom (Z = 9), the Ne+ ion (Z = 10), and the Na++ ion (Z = 11).
(the graph shows F having an Orbital Energy of 692.45, Ne+ with 47.74, and Na++ with 33.52)

a. How many electrons does each species have?

b. According to the graph, which species is most stable?

c. Use Coulomb's law to explain the energy measurements shown in the graph and how this affects the distribution of electrons.