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Einsteinium (Es)
Has no stable isotopes. A standard atomic mass cannot be given. General Name, Symbol, Number einsteinium, Es, 99 Chemical series actinides Group, Period, Block ?, 7, f Appearance unknown, probably silvery white or metallic gray Atomic mass (252) g/mol Electron configuration [Rn] 5f11 7s2 Electrons per shell 2, 8, 18, 32, 29, 8, 2 Physical properties Phase solid Density (near r. ...
Table
| Z(p) | N(n) | isotopic mass (u) | nuclide
symbol | representative
isotopic
composition
(mole fraction) | range of natural
variation
(mole fraction) | | 99 | 141 | 240.06892(43)# | Es-240 | | | | 99 | 142 | 241.06854(24)# | Es-241 | | | | 99 | 143 | 242.06975(35)# | Es-242 | | | | 99 | 144 | 243.06955(25)# | Es-243 | | | | 99 | 145 | 244.07088(20)# | Es-244 | | | | 99 | 146 | 245.07132(22)# | Es-245 | | | | 99 | 147 | 246.07290(24)# | Es-246 | | | | 99 | 148 | 247.07366(3)# | Es-247 | | | | 99 | 149 | 248.07547(6)# | Es-248 | | | | 99 | 150 | 249.07641(3)# | Es-249 | | | | 99 | 151 | 250.07861(11)# | Es-250 | | | | 99 | 152 | 251.079992(7) | Es-251 | | | | 99 | 153 | 252.08298(5) | Es-252 | | | | 99 | 154 | 253.0848247(28) | Es-253 | | | | 99 | 155 | 254.088022(5) | Es-254 | | | | 99 | 156 | 255.090273(12) | Es-255 | | | | 99 | 157 | 256.09360(11)# | Es-256 | | | | 99 | 158 | 257.09598(44)# | Es-257 | | | | 99 | 159 | 258.09952(32)# | Es-258 | | | 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).
Fermium (Fm) Has no stable isotopes. ...
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