Mendelevium-252

Properties and data of the isotope ²⁵²Md.

Content

General data

Name of the isotope:Mendelevium-252; Md-252Symbol:²⁵²Md or 252101MdMass number A:252 (= number of nucleons)Atomic number Z:101 (= number of protons)Neutrons N:151Isotopic mass:252.08643(14) u (atomic weight of Mendelevium-252)Nuclide mass:252.0310317 u (calculated nuclear mass without electrons)Mass excess:80.50903 MeVMass defect:2.012300548 u (per nucleus)Nuclear binding energy:1874.44588666 MeV (per nucleus)
7.43827733 MeV (average binding energy per nucleon)Separation energy:S_N = 6.53(13) MeV (first neutron)
S_P = 2.73(13) MeV (first proton)Half-life:2.3(8) minDecay constant λ:0.0050228056562315 s^-1Specific activity α:1.20031917356 × 10⁺¹⁹ Bq g^-1
324410587.45081 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:1973

Radioactive Decay

Half-life T_½ = 2.3(8) min (minutes) respectively 1.38 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE	²⁵²Fm	≤ 100 %	3.69(13) MeV

Parent Nuclides

Direct parent isotope is: ²⁵⁶Lr.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 151) and isobaric (same nucleon number A = 252) with Mendelevium-252. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 151	Isobar A = 252
92	²⁴²U
93	²⁴⁴Np
94	²⁴⁵Pu
95	²⁴⁶Am
96	²⁴⁷Cm	²⁵²Cm
97	²⁴⁸Bk	²⁵²Bk
98	²⁴⁹Cf	²⁵²Cf
99	²⁵⁰Es	²⁵²Es
100	²⁵¹Fm	²⁵²Fm
101	²⁵²Md	²⁵²Md
102	²⁵³No	²⁵²No
103	²⁵⁴Lr	²⁵²Lr
104	²⁵⁵Rf
105	²⁵⁶Db