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Nobelium (No)
Has no stable isotopes. A standard atomic mass cannot be given. General Name, Symbol, Number nobelium, No, 102 Chemical series actinides Group, Period, Block ?, 7, f Appearance unknown, probably silvery white or metallic gray Atomic mass (259) g/mol Electron configuration [Rn] 5f14 7s2 Electrons per shell 2, 8, 18, 32, 32, 8, 2 Physical properties Phase solid Melting point 1100...
Table
| Z(p) | N(n) | isotopic mass (u) | nuclide
symbol | representative
isotopic
composition
(mole fraction) | range of natural
variation
(mole fraction) | | 102 | 146 | 248.08660(32)# | No-248 | | | | 102 | 147 | 249.08783(37)# | No-249 | | | | 102 | 148 | 250.08751(22)# | No-250 | | | | 102 | 149 | 251.08901(19)# | No-251 | | | | 102 | 150 | 252.088977(14) | No-252 | | | | 102 | 151 | 253.09068(11)# | No-253 | | | | 102 | 152 | 254.090955(19) | No-254 | | | | 102 | 153 | 255.093241(11) | No-255 | | | | 102 | 154 | 256.094283(8) | No-256 | | | | 102 | 155 | 257.096877(23) | No-257 | | | | 102 | 156 | 258.09821(22)# | No-258 | | | | 102 | 157 | 259.10103(11)# | No-259 | | | | 102 | 158 | 260.10264(22)# | No-260 | | | | 102 | 159 | 261.10575(32)# | No-261 | | | | 102 | 160 | 262.10730(48)# | No-262 | | | | 102 | 161 | 263.11055(53)# | No-263 | | | | 102 | 162 | 264.11235(69)# | No-264 | | | Properties In physics, the proton (Greek proton = first) is a subatomic particle with an electric charge of one positive fundamental unit (1. ...
Properties In physics, the neutron is a subatomic particle with no net electric charge and a mass of 939. ...
Notes - Values marked # are not purely derived from experimental data, but at least partly from systematic trends.
- Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values from Ame2003 denote one standard deviation. Values from IUPAC are expanded uncertainties.
References - Isotope masses from Ame2003 Atomic Mass Evaluation by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
- Isotopic compositions and standard atomic masses from Atomic Weights of the Elements: Review 2000 (IUPAC Technical Report). Pure Appl. Chem., Vol. 75, No. 6, pp. 683-800, (2003).
Mendelevium (Md) Has no stable isotopes. ...
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