It's Elemental, Watson.

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Across
  1. 4. Christie's Favourite (7)
  2. 7. Germany's Stereochemical Nightmare (11)
  3. 8. 2011 Was Definitely His Year (3+9)
  4. 10. Ramsay's "Strange One" (5)
  5. 12. Vietnam's Herbicidal Nightmare (5+6)
  6. 14. Kekule's Dream (5)
  7. 15. Takes Little To Excite This One (6)
Down
  1. 1. Faraday's Weak Subject (11)
  2. 2. The Nutty Ingredient Of Dynamite (6)
  3. 3. Author to "A History of Indian Chemistry", He began manufacturing chemicals at home in order to prevent foreign companies to make excessive profits. (1+1+3)
  4. 5. The Fifth Phase (4+8)
  5. 6. Lead Monoxide Has A Lazy Sounding Name (8)
  6. 9. Only 28g Of This Exist On Earth, Making It The Rarest Naturally Occuring Element. (8)
  7. 11. Found In The Saliva Of Vampire Bats (Think Stoker) (8)
  8. 13. Edison's Nemesis (5)