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Sub-Chapter I CHEMICAL ELEMENTS

GENERAL
Chemical elements can be divided into two classes, non‑metals and metals. In general, this sub‑Chapter includes all non‑metals at least in some of their forms, whereas numerous metals are classified elsewhere : ‑ precious metals (Chapter 71 and heading 28.43), base metals (Chapters 72 to 76 and 78 to 81) and radioactive chemical elements and isotopes (heading 28.44) and stable isotopes (heading 28.45).
An alphabetical list of the various known elements, indicating the appropriate classification, is given below. Some elements, such as antimony, behave both as metals and as non‑metals; attention is drawn to their classification in the Nomenclature.
Element Symbol Atomic number Classification
Actinium Ac 89 Radioactive element (28.44).
Aluminium Al 13 Base metal (Chapter 76).
Americium Am 95 Radioactive element (28.44).
Antimony Sb 51 Base metal (81.10).
Argon Ar 18 Rare gas (28.04).
Arsenic As 33 Non.metal (28.04).
Astatine At 85 Radioactive element (28.44).
Barium Ba 56 Alkaline.earth metal (28.05).
Berkelium Bk 97 Radioactive element (28.44).
Beryllium Be 4 Base metal (81.12).
Bismuth Bi 83 Base metal (81.06).
Boron B 5 Non.metal (28.04).
Bromine Br 35 Non.metal (28.01).
Cadmium Cd 48 Base metal (81.07).
Caesium Cs 55 Alkali metal (28.05).
Calcium Ca 20 Alkaline.earth metal (28.05).
Californium Cf 98 Radioactive element (28.44).
Carbon C 6 Non.metal (28.03). (But see 38.01 for artificial graphite.)
Cerium Ce 58 Rare.earth metal (28.05).
Chlorine Cl 17 Non.metal (28.01).
Chromium Cr 24 Base metal (81.12).
Cobalt Co 27 Base metal (81.05).
Copper Cu 29 Base metal (Chapter 74).
Curium Cm 96 Radioactive element (28.44).
Dysprosium Dy 66 Rare.earth metal (28.05).
Einsteinium Es 99 Radioactive element (28.44).
Erbium Er 68 Rare.earth metal (28.05).
Europium Eu 63 Rare.earth metal (28.05).
Fermium Fm 100 Radioactive element (28.44).
Fluorine F 9 Non.metal (28.01).
Francium Fr 87 Radioactive element (28.44).
Gadolinium Gd 64 Rare.earth metal (28.05).
Gallium Ga 31 Base metal (81.12).
Germanium Ge 32 Base metal (81.12).
Gold Au 79 Precious metal (71.08).
Hafnium Hf 72 Base metal (81.12).
Helium He 2 Rare gas (28.04).
Holmium Ho 67 Rare.earth metal (28.05).
Hydrogen H 1 Non.metal (28.04).
Indium In 49 Base metal (81.12)
Iodine I 53 Non.metal (28.01).
Iridium Ir 77 Precious metal (71.10).
Iron Fe 26 Base metal (Chapter 72).
Krypton Kr 36 Rare gas (28.04).
Lanthanum La 57 Rare.earth metal (28.05).
Lawrencium Lr 103 Radioactive element (28.44).
Lead Pb 82 Base metal (Chapter 78).
Lithium Li 3 Alkali metal (28.05).
Lutetium Lu 71 Rare.earth metal (28.05).
Magnesium Mg 12 Base metal (81.04).
Manganese Mn 25 Base metal (81.11).
Mendelevium Md 101 Radioactive element (28.44).
Mercury Hg 80 Metal (28.05).
Molybdenum Mo 42 Base metal (81.02).
Neodymium Nd 60 Rare.earth metal (28.05).
Neon Ne 10 Rare gas (28.04).
Neptunium Np 93 Radioactive element (28.44).
Nickel Ni 28 Base metal (Chapter 75).
Niobium Nb 41 Base metal (81.12).
Nitrogen N 7 Non- metal (28.04).
Nobelium No 102 Radioactive element (28.44).
Osmium Os 76 Precious metal (71.10).
Oxygen O 8 Non.metal (28.04).
Palladium Pd 46 Precious metal (71.10).
Phosphorus P 15 Non.metal (28.04).
Platinum Pt 78 Precious metal (71.10).
Plutonium Pu 94 Radioactive element (28.44).
Polonium Po 84 Radioactive element (28.44).
Potassium K 19 Alkali metal (28.05).
Praseodymium Pr 59 Rare.earth metal (28.05).
Promethium Pm 61 Radioactive element (28.44).
Protactinium Pa 91 Radioactive element (28.44).
Radium Ra 88 Radioactive element (28.44).
Radon Rn 86 Radioactive element (28.44).
Rhenium Re 75 Base metal (81.12).
Rhodium Rh 45 Precious metal (71.10).
Rubidium Rb 37 Alkali metal (28.05).
Ruthenium Ru 44 Precious metal (71.10).
Samarium Sm 62 Rare.earth metal (28.05).
Scandium Sc 21 Classified with the rare.earth metals (28.05).
Selenium Se 34 Non.metal (28.04).
Silicon Si 14 Non.metal (28.04).
Silver Ag 47 Precious metal (71.06).
Sodium Na 11 Alkali metal (28.05).
Strontium Sr 38 Alkaline.earth metal (28.05).
Sulphur S 16 Non.metal (28.02). (But see 25.03 for crude sulphur).
Tantalum Ta 73 Base metal (81.03).
Technetium Tc 43 Radioactive element (28.44).
Tellurium Te 52 Non.metal (28.04).
Terbium Tb 65 Rare.earth metal (28.05).
Thallium Tl 81 Base metal (81.12).
Thorium Th 90 Radioactive element (28.44).
Thulium Tm 69 Rare‑earth metal (28.05).
Tin Sn 50 Base metal (Chapter 80).
Titanium Ti 22 Base metal (81.08).
Tungsten W 74 Base metal (81.01).
Uranium U 92 Radioactive element (28.44).
Vanadium V 23 Base metal (81.12).
Xenon Xe 54 Rare gas (28.04).
Ytterbiium Yb 70 Rare‑earth metal (28.05).
Yttrium Y 39 Classified with the rare‑earth metals (28.05).
Zinc Zn 30 Base metal (Chapter 79).
Zirconium Zr 40 Base metal (81.09).

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