That’s a hard one, but honestly i would go with a.
Answer is Fluorine.
Hope it helps and pls mark as the best answer. :-)
Answer:
Explanation:
Local unit means a county, city, village, or township.
Answer: D) An Mg atom donates one electron to each of the two Cl atoms.
Explanation: Ionic compound is formed by transfer of electrons from metal to non metal.
For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.
Here magnesium is metal with atomic number 12 and chlorine is a non metal with atomic number of 17.




Thus magnesium loses two electrons to form
and chlorine atoms gain one electron each to form 
Thus the compound formed is
.