Elements having the atomic number:9 is fluorine: \\\\((He)2s^22p^5\\\\)17 is chlorine: \\\\((Ne)3s^23p^5\\\\)35 is bromine: \\\\((Ar)4s^24p^5\\\\)53 is iodine: \\\\((Kr)5s^25p^5\\\\)We can observe here that all these elements having the general electronic configuration of \\\\(ns^2np^5\\\\), hence these elements belong to \\\\(17^{th}\\\\) group elements.