Dmitri Mendeleev

Md - Mendelevium

Synthesis 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

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
H He
Li Be B C N O F Ne
Na Mg Al Si P S Cl Ar
K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
Cs Ba La* Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
Fr Ra Ac** Rf Db Sg Bh Hs Mt 110 111 112 113
Lanthanides* Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
Actinides ** Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr

Isotopes of Md: Click mass number for decay process, product for element page.
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 		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 		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 		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 		MASS abund.
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass

Updated by clh on 2/6/98. This is not a publication of Phoenix College.