13. 14. 15. 16. What element in the same group as oxygen has a smaller atomic radius? What element in the same period as antimony has a larger atomic radius? What element in the same group as lithium has a smaller atomic radius? What element in the same group as selenium has a smaller atomic radius? polonium selenium sulfur tellurium none of the above indium jodine nitrogen tellurium none of the above caesium hydrogen potassium sodium none of the above oxygen polonium potassium tellurium none of the above