Mendelevium-244m

Properties and data of the isotope ²⁴⁴Md.

Content

General data

Name of the isotope:Mendelevium-244m; Md-244mSymbol:²⁴⁴Md or 244101MdMass number A:244 (= number of nucleons)Atomic number Z:101 (= number of protons)Neutrons N:143Isotopic mass:244.08116(40) u (atomic weight of Mendelevium-244m)Nuclide mass:244.0257617 u (calculated nuclear mass without electrons)Mass excess:75.60005 MeVMass defect:1.94825122 u (per nucleus)Nuclear binding energy:1814.78432192 MeV (per nucleus)
7.43764066 MeV (average binding energy per nucleon)Half-life:5 msDecay constant λ:138.62943611199 s^-1Specific activity α:3.421499965573 × 10⁺²³ Bq g^-1
9247297204253.5 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:2020

Radioactive Decay

Half-life T_½ = 5 ms respectively 5 × 10^-3 seconds s.

Decay mode	Daughter	Probability
α	²⁴⁰Es	?
EE/β⁺	²⁴⁴Fm	?
SF	div	?

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
²⁴⁴Md		0.38 s

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 143) and isobaric (same nucleon number A = 244) with Mendelevium-244m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 143	Isobar A = 244
84	²²⁷Po
85	²²⁸At
86	²²⁹Rn
87	²³⁰Fr
88	²³¹Ra
89	²³²Ac
90	²³³Th
91	²³⁴Pa
92	²³⁵U
93	²³⁶Np	²⁴⁴Np
94	²³⁷Pu	²⁴⁴Pu
95	²³⁸Am	²⁴⁴Am
96	²³⁹Cm	²⁴⁴Cm
97	²⁴⁰Bk	²⁴⁴Bk
98	²⁴¹Cf	²⁴⁴Cf
99	²⁴²Es	²⁴⁴Es
100	²⁴³Fm	²⁴⁴Fm
101	²⁴⁴Md	²⁴⁴Md