Actinides

89

227

AcActinium

90

232.04

ThThorium

91

231.04

PaProtactinium

92

238.03

UUranium

93

237

NpNeptunium

94

244

PuPlutonium

95

243

AmAmericium

96

247

CmCurium

97

247

BkBerkelium

98

251

CfCalifornium

99

252

EsEinsteinium

100

257

FmFermium

101

258

MdMendelevium

102

259

NoNobelium

103

266

LrLawrencium