How many electrons do all halogen family elements need to gain in order to attain a noble gas configuration?
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. )
Halogens need one more electron to achieve the noble gas configuration
Halogens have the electron configuration of
Noble gases have the electron configuration of
Halogens only need one more electron to fill the p subshell to have the same electron configuration of a noble gas.