Question

Which ion is formed when an atom of fluorine (F) gains one electron?

Answer 1

The answer is F-1since it is gaining therefore you can take this as electron affinity.

Answer 2

Answer: Option (a) is the correct answer.

Explanation:

When an atom or element gains an electron then the atom acquires a negative charge whereas when an atom or element loses an electron then it acquires a positive charge.

for example, atomic number of fluorine is 9 and when it gains one electron then fluorine atom acquires a negative charge. Hence, neutral atom of fluorine changes into $F^{-1}$ ion.

Thus, we can conclude that $F^{-1}$ ion is formed when an atom of fluorine (F) gains one electron.