1. P   Iodine   Krypton   Phosphorus   Chromium   Hint Half-n-half Clue   2. Ir   Gold   Magnesium   Helium   Iridium   Half-n-half Clue   3. Pt   Platinum   Osmium   Sodium   Sulfur   Half-n-half Clue   4. Sn   Osmium   Iridium   Tin   Zinc   Half-n-half Clue   5. U   Bromine   Uranium   Platinum   Silicon   Half-n-half Clue   6. Co   Beryllium   Antimony   Nitrogen   Cobalt   Half-n-half Clue   7. Na   Uranium   Copper   Sodium   Xenon   Half-n-half Clue