Question

identifying ions
which ion is formed when an atom of fluorine (f) gains one electron?
o f^-1
o f^-2
o f^+1
o f^+2

Explanation:

When an atom gains electrons, it forms a negatively - charged ion (anion). Fluorine (F) has 7 valence electrons. When it gains one electron, the number of electrons becomes \(7 + 1=8\), and the number of protons is 9 (atomic number of F). The charge of an ion is calculated as \( \text{Charge}=\text{Number of protons}-\text{Number of electrons}\). So, the charge is \(9 - 8=- 1\). The notation for an ion is \(X^{n}\), where \(X\) is the element symbol and \(n\) is the charge.

Answer:

\(F^{-1}\)