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제28류의 절

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).

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