The correct answer is 2.
In oxidation-reduction reactions (or redox reactions), a number of electrons are transferred between two species. During this process, the oxidation number of an atom (or molecule or ion) changes by receiving or losing an electron.
The elements in group 7, which fluorine is in also, would have similar properties due to the valence electrons and the configuration. <span />
It's B - convection that is correct...
