Subheading 280511: Alkali or Alkali-earth Metals; Sodium
Subheading 280512: Alkali or Alkali-earth Metals; Calcium
Subheading 280519: Alkali or Alkali-earth Metals; other than Sodium and Calcium
Subheading 280530: Earth-metals, Rare; Scandium and Yttrium, whether or not Inte … etc.
Subheading 280540: Mercury