Question

Sodium, atomic number 11, forms an ionic bond with an atom of an unknown element. What is one possible choice for the other element in the compound? A) fluorine B) galium C) neon D) potassium

Answer 1

A is the answer for you

Answer 2

The Answer is A 
This is because sodium needs to give off one electron to be stable, form these options the only element that needs to take one electron to be stable is fluorine thus A is the answer