How many electrons do all halogen family elements need to gain in order to attain a noble gas configuration?

1 Answer
May 17, 2018

Answer:

1

Explanation:

All halogens group VII A have seven valance electrons. There are eight electrons in the valance structure of the Noble Gases ( except Helium that has a filled first energy shell with only electrons. )

# 8-7 = 1#

Halogens need one more electron to achieve the noble gas configuration

Halogens have the electron configuration of #s^2 p^5#
Noble gases have the electron configuration of #s^2 p^6#

Halogens only need one more electron to fill the p subshell to have the same electron configuration of a noble gas.