This halogen is astatine.
Halogen family members, or elements in group 17, have 7 valence electrons.
Halogen elements are part of Group XVII. They have seven electrons in their outer shell. The halogen that is most associated with bleach is chlorine.
When a halogen reacts with a metal, an ionic compound called a metal halide is formed. The metal donates its electrons to the halogen, resulting in the formation of a stable compound. This reaction usually involves the transfer of electrons from the metal to the halogen.
7
The number of electrons in the valence shell of a halogen is 7. What is probably the most significant feature of halogens is that they all are one electron short of the number of electrons required to fill their valence shells, eight. That means they will have similar chemical properties, i.e., they all are on the lookout to borrow one electron.
Halogens are group 17 elements. They have 7 valence electrons.
7
NOTHING
There is no halogen that will become anionic. All of the valence electrons in halogens are filled, thus halogens will not react with any other compound or element. Bromine is an element that will form and anion with 36 electrons.
halogen
halogen
halogen NOTE added by Dr.J.): A halogen doesn't have a few valence electrons. They have 7 valence electrons.