1. Ba   Nickel   Beryllium   Barium   Carbon   Hint Half-n-half Clue   2. Ar   Argon   Nitrogen   Carbon   Osmium   Half-n-half Clue   3. Hg   Phosphorus   Platinum   Barium   Mercury   Half-n-half Clue   4. Sn   Sulfur   Antimony   Tin   Zinc   Half-n-half Clue   5. Os   Manganese   Platinum   Tungsten   Osmium   Half-n-half Clue   6. Fe   Iron   Xenon   Lead   Sulfur   Half-n-half Clue   7. Ne   Iridium   Neon   Zinc   Argon   Half-n-half Clue