Mendeleev's Periodic Table > Md - Mendelevium

Md - Mendelevium

Mendelevium is a radioactive rare earth metal named after Dmitri Mendeleev, father of the Periodic Table. Mendelevium was obtained in 1955 by alpha bombardment of einsteinium by Albert Ghiorso with Harvey, Choppin, Thompson and Glenn Seaborg at Berkeley.

Atomic number - 101 Density g/mL -
Atomic weight u 258 Melting point K -
Bonding radius A - Boiling point K -
Atomic radius A - Heat of vaporization kJ/mol -
Ionization Potential V 6 .58 Heat of fusion kJ/mol -
Electronegativity - 1 .3 Specific heat J/gK -
The oxide is unknown. Crystal are unknown.
Electron config. : [Rn] 5f13 7s2

Isotopes of Md (Mendelevium) :

MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 247
2.9 sec
a,8.820 MeV
Es-243
247.08169 		248
7 sec
a/EC/SF,5.250
Es-244/Fm-248/?
248.08282 		249
24 sec
a/EC,8.460
Es-245/Fm-249
249.08298 		250
52 sec
a/EC,4.600
Es-246/Fm-250
250.08448
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 251
4.0 min
a/EC,3.070
Es-247/Fm-251
251.08486 		252
4.8 min
EC,3.890 MeV
Fm-252
252.08662 		253
6 min
EC,1.960 MeV
Fm-253
253.08727 		254
28 min
EC,2.680 MeV
Fm-254
254.08972
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 255
27 min
a/EC/SF,1.043
Es-251/Fm-255/?
255.09107 		256
78.1 min
a/EC/SF,2.130
Es-252/Fm-256/?
256.09405 		257
5.3 hr
a/EC/SF,6.864
Es-253/Fm-257/?
257.09553 		258
60 min
EC,1.230 MeV
Fm-258
258.09842
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 258a
51.5 da
SF,7.271 MeV
?
258.09842 		259
1.60 hr
a/SF,3.380
Es-255/?
259.10048 		260
27.8 da
a/B-/EC/SF,1.810
Es-256/No-260/Fm-260/?
260.10370


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