Question

Give valence shell configuration of halogens and Nobel gases

Answer 1

Answer:

The elements of Group 17 (fluorine, chlorine, bromine, iodine, and astatine) are called the halogens. The halogens all have the general electron configuration ns2np5, giving them seven valence electrons. They are one electron short of having full outer s and p sublevels, which makes them very reactive

Answer 2

Answer:

For halogen in their last or valence shell there are 7 electrons hence their valency is 1. For noble gases their valence shell has 8 electrons which is complete.Hence their valency is 0.They do not react with other elements.