1. The horizontal rows in a periodic table are called   Atomic Structures   Groups   Lanthanides   Periods   Hint Half-n-half Clue   2. The vertical rows in a periodic table are called   Alkali Metals   Noble Gases   Groups   Periods   Half-n-half Clue   3. The first element in the modern periodic table is   Lithium   Helium   Oxygen   Hydrogen   Half-n-half Clue   4. The Law of Octaves was given by   Bohr   Dobereiner   John Newlands   Mendeleev   Half-n-half Clue   5. The first noble gas in the periodic table is   Hydrogen   Neon   Helium   Argon   Half-n-half Clue   6. Which element has the atomic number 8?   Nitrogen   Lithium   Helium   Oxygen   Half-n-half Clue   7. Elements at the extreme right of the periodic table are   Alkali Metals   Noble Gases   Halogens   Transition Metals   Half-n-half Clue