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原子序数名称符号相对原子质量1 氢 H 1.00794(7)2 氦 He 4.002602(2)3 锂 Li 6.941(2)4 铍 Be 9.012182(3)5 硼 B 10.811(5)6 碳 C 12.011(1)7 氮 N 14.00674(7)8 氧 O 15.9994(3)9 氟 F 18.9984032(9)10 氖 Ne 20.1797(6)11 钠 Na 22.989768(6)12 镁 Mg 24.3050(6)38 锶 Sr 87.62(1)39 钇 Y 88.90585(2)40 锆 Zr 91.224(2)41 铌 Nb 92.90638(2)42 钼 Mo 95.94(1)43 锝 Tc44 钉 Ru 101.07(2)45 铑 Rh 102.90550(3)46 钯 Pd 106.42(1)47 银 Ag 107.8682(2)48 镉 Cd 112.411(8)49 铟 In 114.82(1)50 锡 Sn 118.710(7)
Atomic number Name Symbol Relative atomic mass 1 Hydrogen 1.00754 (7) 2 He He 4.002602 (2) 3 Lithium Li 6.941 (2) 4 Beryllium Be 9.012182 (3) 5 Boron B 10.811 (5) 6 Carbon C 12.011 (1) 7 Nitrogen N 14.00674 (8) 8 Oxygen 15.9994 (9) 9 Fluorine F 18.9984032 (9) 10 Ne Ne 20.1797 (11) Sodium Na 22.989768 (12) 12 Magnesium Mg 24.3050 (38) Strontium Sr 87.62 (1) 39 Yttrium Y 88.90585 (2) 40 Zirconium Zr 91.224 (2) 41 Nb Nb 92.90638 (42) 42 Molybdenum Mo 95.94 (1) 43 Technetium Tc44 Nail Ru 101.07 (2) 45 Rhodium Rh 102.90550 46 Palladium Pd 106.42 (1) 47 Silver Ag 107.8682 (2) 48 Cadmium Cd 112.411 (8) 49 Indium In 114.82 (1) 50 Tin Sn 118.710 (7)