The elements with atomic numbers 35, 53, and 85 are all ................ — Periodic Table and Periodicity Chemistry Question

💡 Solution & Explanation

The elements with atomic number 35, 53 and 85 are all halogens as the electronic configuration of the elements will be, 35=2,8,18,7 53=2,8,18,18,7 85=2,8,18,18,32,7 Hence, all the given elements have 7 electrons in their outermost valence shell and therefore, all of them are halogens belonging to the 17th group where Bromine, Iodine, and Astatine have atomic numbers 35, 53, and 85 respectively.