1. Be   Copper   Iron   Beryllium   Phosphorus   Hint Half-n-half Clue   2. Co   Uranium   Krypton   Cobalt   Potassium   Half-n-half Clue   3. Al   Carbon   Aluminum   Helium   Iodine   Half-n-half Clue   4. Pt   Sodium   Magnesium   Antimony   Platinum   Half-n-half Clue   5. Ar   Lithium   Fluorine   Hydrogen   Argon   Half-n-half Clue   6. Mg   Antimony   Cadmium   Magnesium   Argon   Half-n-half Clue   7. Cr   Helium   Boron   Nitrogen   Chromium   Half-n-half Clue