2804Level 3

Hydrogen, rare gases and other non-metals

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280410Hydrogen

280421Gases, rare; argon

280429Gases, rare; other than argon

280430Nitrogen

280440Oxygen

280450Boron; tellurium

280461Silicon; containing by weight not less than 99.99% of silicon

280469Silicon; containing by weight less than 99.99% of silicon

280470Phosphorus

280480Arsenic

280490Selenium

No cross-system equivalences mapped for this node.