ATOMIC PROPERTIES OF THE ELEMENTS

Element Atomic mass
Relative to 1/12 of 12C		 Atomic radius
pm		 1st Ionization energy
J.mol-1
Hydrogen (H)
Helium (He)
Lithium (Li)
Beryllium (Be)
Boron (B)
Carbon (C)
Nitrogen (N)
Oxygen (O)
Fluorine (F)
Neon (Ne)
Sodium (Na)
Magnesium (Mg)
Aluminium (Al)
Silicon (Si)
Phosphorus (P)
Sulphur (S)
Chlorine (Cl)
Argon (Ar)
Potassium (K)
Calcium (Ca)
Scandium (Sc)
Titanium (Ti)
Vanadium (V)
Chromium (Cr)
Manganese (Mn)
Iron (Fe)
Cobalt (Co)
Nickel (Ni)
Copper (Cu)
Zinc (Zn)
Gallium (Ga)
Germanium (Ge)
Arsenic (As)
Selenium (Se)
Bromine (Br)
Krypton (Kr)
Rubidium (Rb)
Strontium (Sr)
Yttrium (Y)
Zirconium (Zr)
Niobium (Nb)
Molybdenum (Mo)
Technetium (Tc)
Ruthenium (Ru)
Rhodium (Rh)
Palladium (Pd)
Silver (Ag)
Cadmium (Cd)
Indium (In) 114.82
Tin (Sn) 118.69
Antimony (Sb)
Tellurium (Te)
Iodine (I)
Xenon (Xe)
Cesium (Cs)
Barium (Ba)
Lanthanum (La)
Cerium (Ce)
Praseodymium (Pr)
Neodymium (Nd)
Promethium (Pm)
Samarium (Sm)
Europium (Eu)
Gadolinium (Gd)
Terbium (Tb)
Dysprosium (Dy)
Holmium (Ho)
Erbium (Er)
Thulium (Tm)
Ytterbium (Yb)
Lutetium (Lu)
Hafnium (Hf)
Tantalum (Ta)
Tungsten (W)
Rhenium (Re)
Osmium (Os)
Iridium (Ir)
Platinum (Pt)
Gold (Au) 196.97
Mercury (Hg) 200.59
Thallium (Tl)
Lead (Pb)
Bismuth (Bi)
Polonium (Po)
Astatine (At)
Radon (Rn)
Francium (Fr)
Radium (Ra)
Actinium (Ac)
Thorium (Th)
Protoactinium (Pa)
Uranium (U)
Neptunium (Np)
Plutonium (Pu)
Americium (Am
Curium (Cm)
Berkelium (Bk)
Californium (Bk)
Einsteinium (Es)
Fermium (Fm)
Mendelevium (Md)
Nobelium (No)
Lawrentium (Lr)
Rutherfordium (Rf)
Dubnium (Db)
Seaborgium (Sg)
Bohrium (Bh)
Hassium (Hs)
Meitnerium (Mt)
 1.008
4.00
6.94
9.01
10.81
12.01
14.007
16.00
18.998
20.183
22.990
24.312
26.982
28.086
30.97
32.064
35.453
39.948
39.102
40.08
44.96
47.90
50.942
51.996
54.938
55.847
59.933
58.71
63.54
65.37
69.72
72.59
74.922
78.96
79.909
83.80
85.47
87.62
88.905
91.22
92.906
95.94
98
101.07
102.91
106.4
107.87
112.40
114.82
118.69
121.75
127.60
126.90
131.30
132.105
137.34
138.91
140.12
140.91
144.24
(147)
150.35
151.96
157.25
158.924
162.50
164.930
167.26
168.934
173.04
174.97
178.49
180.95
183.85
186.2
190.2
192.2
195.09
196.97
200.59
204.37
207.19
208.98
210
210
222
223
226.025
227
232.04
231.0
238.03
237
242
243
247
247
251
254
253
256
254
257
 37
93
152
111
79
77
74
74
71
71
186
738
143
117
110
103
100
98
231
197
160
145
131
125
137
124
125
125
128
133
122
123
124
116
114
112
248
215
178
158
142
136
132
133
134
138
144
149
162
140
145
143
133
131
265
217
187
183
182
181
181
181
199
179
176
175
174
173
172
194
171
157
143
127
137
134
136
139
144
151
170
175
155
167


270
220
200
 1312
2372
520
899
800
1086
1403
1313
1681
2080
496
738
578
786
1012
999
1255
1520
419
590
631
656
650
653
717
762
758
737
745
906
579
760
947
941
1142
1351
403
550
615
660
665
685
700
710
720
805
730
870
560
710
835
870
1010
1170
337
503
541
658
553
612
553
545
549
591
649
654

587
561
595
591
675
760
770
758
820
875
868
890
1006
578
716
704
813
917
1035
386
511
666
671