# Question #e9166

Jun 8, 2017

Well, as you know (or should know), covalent bonding results from the SHARING of electrons..........

#### Explanation:

And ionic bonding results from the transfer of electrons to form discrete positive and negative ions.

Atomic fluorine or atomic chlorine each has 7 valence electrons (of course they do; they are halogens that come from Group VII of the Periodic Table). Ideally, they would have 8 valence electrons, and one way they can do this is by reduction............i.e.

$\dot{X} + {e}^{-} \rightarrow {\ddot{X}}^{-}$

And in fact fluorine is the most potent oxidant on the Periodic Table.

Alternatively, they could form covalent bonds, in which a PAIR of electrons is shared BETWEEN the 2 nuclei.........

$\dot{X} + \dot{X} \rightarrow X - X$

And thus for the elemental halogens we commonly get a homonuclear diatomic molecule. Heteronuclear diatomic molecules are also possible, so-called interhalogens i.e.

$\dot{F} + \dot{C} l \rightarrow \stackrel{+ \delta}{C} l - \stackrel{- \delta}{F}$..........

Capisce?