1. Cr   Chromium   Cadmium   Tin   Xenon   Hint Half-n-half Clue   2. Sb   Chromium   Magnesium   Antimony   Neon   Half-n-half Clue   3. Ag   Copper   Krypton   Boron   Silver   Half-n-half Clue   4. Sn   Tin   Manganese   Silicon   Lead   Half-n-half Clue   5. C   Copper   Carbon   Chlorine   Fluorine   Half-n-half Clue   6. W   Tungsten   Mercury   Lithium   Krypton   Half-n-half Clue   7. Hg   Manganese   Mercury   Chromium   Uranium   Half-n-half Clue