Question

Halogen elements are those which are:

• A. diatomic and form $X^{--}$ ions
• B. monatomic and form $X^{-}$ ions
• C. diatomic and form $X^{-}$ ions
• D. monoatomic and form $X^{--}$ ions

Answer 1

The correct option is C diatomic and form $X^{-}$ ions

Halogen atoms have 7 electrons in their valence shell. So, they require only one electron to complete its octet. Thus, halogens are present in a diatomic form in order to complete their octet by sharing of electrons. Also,

$x+e^{-}\to x^{-}\left(stableforHalogens\right)$