1. B   Tin   Oxygen   Boron   Zinc   Hint Half-n-half Clue   2. Br   Bromine   Hydrogen   Helium   Krypton   Half-n-half Clue   3. S   Iron   Silver   Tungsten   Sulfur   Half-n-half Clue   4. Cu   Osmium   Mercury   Neon   Copper   Half-n-half Clue   5. Ar   Antimony   Calcium   Argon   Sodium   Half-n-half Clue   6. Na   Sodium   Xenon   Krypton   Antimony   Half-n-half Clue   7. Sn   Tin   Bromine   Zinc   Iridium   Half-n-half Clue