1. Magnesium has an atomic number of   10   16   24   12   Hint Half-n-half Clue   2. The horizontal rows in a periodic table are called   Atomic Structures   Periods   Groups   Lanthanides   Half-n-half Clue   3. Mercury is a   Non metal   Noble Gas   Metal   Lanthanide   Half-n-half Clue   4. The first noble gas in the periodic table is   Neon   Hydrogen   Argon   Helium   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   Lothar Meyer   Bohr   Mendeleev   Moseley   Half-n-half Clue   6. The element with atomic weight 14 is   Nitrogen   Carbon   Boron   Oxygen   Half-n-half Clue   7. The vertical rows in a periodic table are called   Alkali Metals   Periods   Noble Gases   Groups   Half-n-half Clue