H He □Bulk elements 6 6 10 Li Be Trace elements B N 0 Ne 11 12 13 14 15 1 18 Na Mg AI Si P I Ar 19 20 21 22 29 24 25 26 27 28 29 90 91 32 98 95 96 K Ca Se Ti Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr 37 38 39 40 41 42 44 45 46 48 49 50 51 52 54 Rb Sr Zr Nb Mo Te Ru Rh Ag Cd In Sn Sb Te Xe 55 56 72 79 74 75 76 77 79 80 81 83 85 86 Cs Ba 个 Hf Ta W Re 08 r Pt Au Hg Pb Bi Po At Rn 87 88 Lanthanides Fr Ra Actinides Elements essential to animal life and health 水母 Elements essential to animal life and health