Physics For Scientists And Engineers 6E - part 324

A.10

Appendix A

(62)

Samarium

149*

148.917 180

13.82

4

2 ! 10

15

yr

150

149.917 272

7.38

151*

150.919 928

90 yr

152

151.919 728

26.75

154

153.922 205

22.75

63

Europium

Eu

151.964

151

150.919 846

47.81

152*

151.921 740

13.5 yr

153

152.921 226

52.19

154*

153.922 975

8.59 yr

155*

154.922 889

4.7 yr

64

Gadolinium

Gd

157.25

148*

147.918 110

75 yr

150*

149.918 656

1.8 ! 10

6

yr

152*

151.919 788

0.20

1.1 ! 10

14

yr

154

153.920 862

2.18

155

154.922 619

14.80

156

155.922 120

20.47

157

156.923 957

15.65

158

157.924 100

24.84

160

159.927 051

21.86

65

Terbium

Tb

158.925 34

159

158.925 343

100

66

Dysprosium

Dy

162.50

156

155.924 278

0.06

158

157.924 405

0.10

160

159.925 194

2.34

161

160.926 930

18.91

162

161.926 795

25.51

163

162.928 728

24.90

164

163.929 171

28.18

67

Holmium

Ho

164.930 32

165

164.930 320

100

166*

165.932 281

1.2 ! 10

3

yr

68

Erbium

Er

167.6

162

161.928 775

0.14

164

163.929 197

1.61

166

165.930 290

33.61

167

166.932 045

22.93

168

167.932 368

26.78

170

169.935 460

14.93

69

Thulium

Tm

168.934 21

169

168.934 211

100

171*

170.936 426

1.92 yr

70

Ytterbium

Yb

173.04

168

167.933 894

0.13

170

169.934 759

3.04

171

170.936 322

14.28

172

171.936 378

21.83

173

172.938 207

16.13

174

173.938 858

31.83

176

175.942 568

12.76

71

Lutecium

Lu

174.967

173*

172.938 927

1.37 yr

175

174.940 768

97.41

176*

175.942 682

2.59

3.78 ! 10

10

yr

Mass

Number

Atomic

Chemical

(*Indicates

Half-Life

Number

Atomic

Radioactive)

Atomic

Percent

(If Radioactive)

Z

Element

Symbol

Mass (u)

A

Mass (u)

Abundance

T

1/2

Table of Atomic Masses

a

continued

Table A.3

continued

continued

Appendix A

A.11

72

Hafnium

Hf

178.49

174*

173.940 040

0.16

2.0 ! 10

15

yr

176

175.941 402

5.26

177

176.943 220

18.60

178

177.943 698

27.28

179

178.945 815

13.62

180

179.946 549

35.08

73

Tantalum

Ta

180.947 9

180*

179.947 466

0.012

8.152 h

181

180.947 996

99.988

74

Tungsten

W

183.84

180

179.946 706

0.12

(Wolfram)

182

181.948 206

26.50

183

182.950 224

14.31

184*

183.950 933

30.64

4

3 ! 10

17

yr

186

185.954 362

28.43

75

Rhenium

Re

186.207

185

184.952 956

37.40

187*

186.955 751

62.60

4.4 ! 10

10

yr

76

Osmium

Os

190.23

184

183.952 491

0.02

186*

185.953 838

1.59

2.0 ! 10

15

yr

187

186.955 748

1.96

188

187.955 836

13.24

189

188.958 145

16.15

190

189.958 445

26.26

192

191.961 479

40.78

194*

193.965 179

6.0 yr

77

Iridium

Ir

192.217

191

190.960 591

37.3

193

192.962 924

62.7

78

Platinum

Pt

195.078

190*

189.959 930

0.014

6.5 ! 10

11

yr

192

191.961 035

0.782

194

193.962 664

32.967

195

194.964 774

33.832

196

195.964 935

25.242

198

197.967 876

7.163

79

Gold

Au

196.966 55

197

196.966 552

100

80

Mercury

Hg

200.59

196

195.965 815

0.15

198

197.966 752

9.97

199

198.968 262

16.87

200

199.968 309

23.10

201

200.970 285

13.18

202

201.970 626

29.86

204

203.973 476

6.87

81

Thallium

Tl

204.383 3

203

202.972 329

29.524

204*

203.973 849

3.78 yr

205

204.974 412

70.476

(Ra E6)

206*

205.976 095

4.2 min

(Ac C6)

207*

206.977 408

4.77 min

(Th C6)

208*

207.982 005

3.053 min

(Ra C6)

210*

209.990 066

1.30 min

Mass

Number

Atomic

Chemical

(*Indicates

Half-Life

Number

Atomic

Radioactive)

Atomic

Percent

(If Radioactive)

Z

Element

Symbol

Mass (u)

A

Mass (u)

Abundance

T

1/2

Table of Atomic Masses

a

continued

Table A.3

continued

A.12

Appendix A

82

Lead

Pb

207.2

202*

201.972 144

5 ! 10

4

yr

204*

203.973 029

1.4

5

1.4 ! 10

17

yr

205*

204.974 467

1.5 ! 10

7

yr

206

205.974 449

24.1

207

206.975 881

22.1

208

207.976 636

52.4

(Ra D)

210*

209.984 173

22.3 yr

(Ac B)

211*

210.988 732

36.1 min

(Th B)

212*

211.991 888

10.64 h

(Ra B)

214*

213.999 798

26.8 min

83

Bismuth

Bi

208.980 38

207*

206.978 455

32.2 yr

208*

207.979 727

3.7 ! 10

5

yr

209

208.980 383

100

(Ra E)

210*

209.984 105

5.01 days

(Th C)

211*

210.987 258

2.14 min

212*

211.991 272

60.6 min

(Ra C)

214*

213.998 699

19.9 min

215*

215.001 832

7.4 min

84

Polonium

Po

209*

208.982 416

102 yr

(Ra F)

210*

209.982 857

138.38 days

(Ac C7)

211*

210.986 637

0.52 s

(Th C7)

212*

211.988 852

0.30

0

s

(Ra C7)

214*

213.995 186

164

0

s

(Ac A)

215*

214.999 415

0.001 8 s

(Th A)

216*

216.001 905

0.145 s

(Ra A)

218*

218.008 966

3.10 min

85

Astatine

At

215*

214.998 641

! 100

0

s

218*

218.008 682

1.6 s

219*

219.011 297

0.9 min

86

Radon

Rn
(An)

219*

219.009 475

3.96 s

(Tn)

220*

220.011 384

55.6 s

(Rn)

222*

222.017 570

3.823 days

87

Francium

Fr
(Ac K)

223*

223.019 731

22 min

88

Radium

Ra
(Ac X)

223*

223.018 497

11.43 days

(Th X)

224*

224.020 202

3.66 days

(Ra)

226*

226.025 403

1 600 yr

(Ms Th

1

)

228*

228.031 064

5.75 yr

89

Actinium

Ac

227*

227.027 747

21.77 yr

(Ms Th

2

)

228*

228.031 015

6.15 h

90

Thorium

Th

232.038 1

(Rd Ac)

227*

227.027 699

18.72 days

(Rd Th)

228*

228.028 731

1.913 yr

229*

229.031 755

7 300 yr

(Io)

230*

230.033 127

75.000 yr

Mass

Number

Atomic

Chemical

(*Indicates

Half-Life

Number

Atomic

Radioactive)

Atomic

Percent

(If Radioactive)

Z

Element

Symbol

Mass (u)

A

Mass (u)

Abundance

T

1/2

Table of Atomic Masses

a

continued

Table A.3

continued

continued

Appendix A

A.13

Mass

Number

Atomic

Chemical

(*Indicates

Half-Life

Number

Atomic

Radioactive)

Atomic

Percent

(If Radioactive)

Z

Element

Symbol

Mass (u)

A

Mass (u)

Abundance

T

1/2

Table of Atomic Masses

a

continued

Table A.3

(90)

Thorium

(UY)

231*

231.036 297

25.52 h

(Th)

232*

232.038 050

100

1.40 ! 10

10

yr

(UX

1

)

234*

234.043 596

24.1 days

91

Protactinium

Pa

231.035 88

231*

231.035 879

32.760 yr

(Uz)

234*

234.043 302

6.7 h

92

Uranium

U

238.028 9

232*

232.037 146

69 yr

233*

233.039 628

1.59 ! 10

5

yr

234*

234.040 946

0.005 5

2.45 ! 10

5

yr

(Ac U)

235*

235.043 923

0.720 0

7.04 ! 10

8

yr

236*

236.045 562

2.34 ! 10

7

yr

(UI)

238*

238.050 783

99.274 5

4.47 ! 10

9

yr

93

Neptunium

Np

235*

235.044 056

396 days

236*

236.046 560

1.15 ! 10

5

yr

237*

237.048 167

2.14 ! 10

6

yr

94

Plutonium

Pu

236*

236.046 048

2.87 yr

238*

238.049 553

87.7 yr

239*

239.052 156

2.412 ! 10

4

yr

240*

240.053 808

6 560 yr

241*

241.056 845

14.4 yr

242*

242.058 737

3.73 ! 10

6

yr

244*

244.064 198

8.1 ! 10

7

yr

a

Chemical atomic masses are from T. B. Coplen, “Atomic Weights of the Elements 1999,” a technical report to the International Union of Pure and
Applied Chemistry, and published in Pure and Applied Chemistry, 73(4), 667–683, 2001. Atomic masses of the isotopes are from G. Audi and 
A. H. Wapstra, “The 1995 Update to the Atomic Mass Evaluation,” Nuclear Physics, A595, vol. 4, 409–480, December 25, 1995. Percent abundance
values are from K. J. R. Rosman and P. D. P. Taylor, “Isotopic Compositions of the Elements 1999”, a technical report to the International Union of 
Pure and Applied Chemistry, and published in Pure and Applied Chemistry, 70(1), 217–236, 1998.