3. make an argument for placing hydrogen in the halogen group rather than the alkali metals. 4. compare and contrast ionization energy and atomic radius. 5. when the element with the atomic number of 119 is discovered, what group will it be in? explain your logic. 6. a new element is discovered that is very unstable and highly reactive, and it likes to lose its one valence electron. in what group should this element be placed in? explain.