PHÂN CHƯƠNG ISub-chapter
PHÂN CHƯƠNG I — CHEMICAL ELEMENTS
CÁC NGUYÊN TỐ HÓA HỌC
Codes under heading PHÂN CHƯƠNG I
- 2801 Fluorine, chlorine, bromine and iodine
- 28020000 Sulphur, sublimed or precipitated; colloidal sulphur
- 2803 Carbon (carbon blacks and other forms of carbon not elsewhere specified or included)
- 2804 Hydrogen, rare gases and other non-metals
- 2805 Alkali or alkaline-earth metals; rare-earth metals, scandium and yttrium, whether or not intermixed or interalloyed; mercury
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