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preface to fifteenth edition

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PROPERTIES OF ATOMS, RADICALS, AND BONDS 4.81<br />

TABLE 4.17<br />

Work Functions of the Elements (Continued)<br />

Element , eV Element , eV<br />

Nb 4.20<br />

Nd 3.1<br />

Ni 5.15<br />

Os 4.83<br />

Pb 4.18<br />

Pd 5.00<br />

Po 4.6<br />

Pr 2.7<br />

Pt 5.40<br />

Rb 2.20<br />

Re 4.95<br />

Rh 4.98<br />

Ru 4.80<br />

Sb 4.56<br />

Sc 3.5<br />

Se 5.9<br />

Si 4.85<br />

Sm 2.95<br />

Sn 4.35<br />

Sr 2.76<br />

Ta 4.22<br />

Tb 3.0<br />

Te 4.70<br />

Th 3.71<br />

Ti 4.10<br />

Tl 4.02<br />

U 3.70<br />

V 4.44<br />

W 4.55<br />

Y 3.1<br />

Zn 4.30<br />

Zr 4.00<br />

Source: S. Trasatti, J. Chem. Soc. Faraday Trans. I 68:229 (1972); N. D. Lang and W. Kohn, Phys. Rev. B 3:1215 (1971).<br />

4.10 RELATIVE ABUNDANCES OF NATURALLY<br />

OCCURRING ISOTOPES<br />

TABLE 4.18<br />

Relative Abundances of Naturally Occurring Iso<strong>to</strong>pes<br />

Element<br />

Mass<br />

number Percent Element<br />

Mass<br />

number<br />

Percent<br />

Aluminum 27 100<br />

Antimony 121 57.21(5)<br />

123 42.79(5)<br />

Argon 36 0.337(3)<br />

38 0.063(1)<br />

40 99.600(3)<br />

Arsenic 75 100<br />

Barium 130 0.106(2)<br />

132 0.101(2)<br />

134 2.42(3)<br />

135 6.59(2)<br />

136 7.85(4)<br />

137 11.23(4)<br />

138 71.70(7)<br />

Beryllium 9 100<br />

Bismuth 209 100<br />

Boron 10 19.9(2)<br />

11 80.1(2)<br />

Bromine 79 50.69(7)<br />

81 49.31(7)<br />

Cadmium 106 1.25(4)<br />

108 0.89(2)<br />

110 12.49(12)<br />

111 12.80(8)<br />

Cadmium 112 24.13(14)<br />

113 12.22(8)<br />

114 28.7(3)<br />

116 7.49(9)<br />

Calcium 40 96.941(18)<br />

42 0.647(9)<br />

43 0.135(6)<br />

44 2.088(12)<br />

46 0.004(3)<br />

48 0.187(4)<br />

Carbon 12 98.89(1)<br />

13 1.11(1)<br />

Cerium 136 0.19(1)<br />

138 0.25(1)<br />

140 88.43(10)<br />

142 11.13(10)<br />

Cesium 133 100<br />

Chlorine 35 75.77(7)<br />

37 24.23(7)<br />

Chromium 50 4.345(13)<br />

52 83.79(2)<br />

53 9.50(2)<br />

54 2.365(7)<br />

Cobalt 59 100

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