1. The horizontal rows in a periodic table are called   Atomic Structures   Lanthanides   Groups   Periods   Hint Half-n-half Clue   2. Elements in the same group have similar   atomic numbers   atomic radii   atomic masses   chemical properties   Half-n-half Clue   3. The least reactive elements of the periodic table are   Transition Metals   Alkaline Earth Metals   Noble Gases   Alkali Metals   Half-n-half Clue   4. Mercury is a   Lanthanide   Noble Gas   Metal   Non metal   Half-n-half Clue   5. The law that "the physical and chemical properties of elements are periodic functions of their atomic weights" was given by   Bohr   Mendeleev   Moseley   Lothar Meyer   Half-n-half Clue   6. The vertical rows in a periodic table are called   Periods   Groups   Alkali Metals   Noble Gases   Half-n-half Clue   7. Elements at the extreme right of the periodic table are   Halogens   Noble Gases   Transition Metals   Alkali Metals   Half-n-half Clue