The element which readily forms an ionic bond has the electronic configuration

• A
  $1 s^2 2 s^2 2 p^3$
• B
  $1 s^2 2 s^2 2 p^1$
• C
  $1 s^2 2 s^2 2 p^2$
• D
  $1 s^2 2 s^2 2 p^6 3 s^1$