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 20210311