1 H 氢1.0079 2 He 氦4.0026 3 Li 锂6.941 4 Be 铍9.0122 5 B 硼10.811 6 C 碳12.011 7 N 氮14.007 8 O 氧15.999 9 F 氟18.998 10 Ne 氖20.17 11 Na 钠22.9898 12 Mg 镁24.305 13 Al 铝26.982 14 Si 硅28.085 15 P 磷30.974 16 S 硫32.06 17 Cl 氯35.453 18 Ar 氩39.94 19 K 钾39.098 20 Ca 钙40.08
