1. Magnesium has an atomic number of   10   16   12   24   Hint Half-n-half Clue   2. The law that "the physical and chemical properties of elements are periodic functions of their atomic weights" was given by   Bohr   Moseley   Mendeleev   Lothar Meyer   Half-n-half Clue   3. The horizontal rows in a periodic table are called   Periods   Groups   Atomic Structures   Lanthanides   Half-n-half Clue   4. The vertical rows in a periodic table are called   Noble Gases   Periods   Alkali Metals   Groups   Half-n-half Clue   5. The element with atomic weight 14 is   Boron   Nitrogen   Oxygen   Carbon   Half-n-half Clue   6. The least reactive elements of the periodic table are   Transition Metals   Noble Gases   Alkaline Earth Metals   Alkali Metals   Half-n-half Clue   7. The first element in the modern periodic table is   Helium   Lithium   Hydrogen   Oxygen   Half-n-half Clue