I have to list two similarities for these electron configurations:
Bromine: [Ar] 3d10 4s2 4p5
Iodine: [Kr] 4d10 5s2 5p5
Chlorine: [Ne] 3s2 3p5
but I'm not sure what to look for, can someone help?
3 answers
outer p has five electrons, next lower has two s electrons And, they are all of valence 7, and are all in the same family.
Based off of the configuration I wrote, would these have similar chemical properties?
Of course they would have similar chemicl properties. The periodic table was developed by Mendeleev that very observation.