Hydrogen, rare gases and other nonmetals:

2804.10.00.00Hydrogen 2804.21.00.00Argon 2804.29.00Other 2804.29.00.10Helium 2804.29.00.20Neon 2804.29.00.30Isotopically pure rare gases having a purity of 99 percent or more by volume 2804.29.00.55Other 2804.30.00.00Nitrogen 2804.40.00.00Oxygen 2804.50.00Boron; tellurium 2804.50.00.10Boron 2804.50.00.20Tellurium 2804.61.00.00Containing by weight not less than 99.99 percent of silicon 2804.69Other: 2804.69.10.00Containing by weight less than 99.99 percent but not less than 99 percent of silicon 2804.69.50.00Other 2804.70.00.00Phosphorus 2804.80.00.00Arsenic 2804.90.00.00Selenium