1. I   Hydrogen   Uranium   Iodine   Cadmium   Hint Half-n-half Clue   2. S   Osmium   Tungsten   Sulfur   Uranium   Half-n-half Clue   3. Xe   Antimony   Xenon   Mercury   Boron   Half-n-half Clue   4. Cr   Chromium   Chlorine   Antimony   Copper   Half-n-half Clue   5. Al   Chromium   Platinum   Aluminum   Chlorine   Half-n-half Clue   6. Ar   Argon   Magnesium   Copper   Chlorine   Half-n-half Clue   7. N   Nitrogen   Platinum   Hydrogen   Cobalt   Half-n-half Clue