Nobelium-252

Properties and data of the isotope ²⁵²No.

Contents

General data

Name of the isotope:Nobelium-252; No-252Symbol:²⁵²No or 252102NoMass number A:252 (= number of nucleons)Atomic number Z:102 (= number of protons)Neutrons N:150Isotopic mass:252.088966(10) u (atomic weight of Nobelium-252)Nuclide mass:252.0330193 u (calculated nuclear mass without electrons)Mass excess:82.8713 MeVMass defect:2.008924664 u (per nucleus)Nuclear binding energy:1871.30127097 MeV (per nucleus)
7.42579869 MeV (average binding energy per nucleon)Separation energy:S_N = 8.05(11) MeV (first neutron)
S_P = 3.384(21) MeV (first proton)Half-life:2.44(4) sDecay constant λ:0.28407671334424 s^-1Specific activity α:6.788690407884 × 10⁺²⁰ Bq g^-1
18347811913.201 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1967

Radioactive Decay

Half-life T_½ = 2.44(4) s.

Decay mode	Daughter	Probability	Decay energy
SZ	div.	32.2(5) %
α	²⁴⁸Fm	66.7(6) %	8.549(5) MeV
EE/β⁺	²⁵²Md	1.1(4) %	2,36(13) MeV

Parent Nuclides

Direct parent isotope is: ²⁵⁶Rf.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 150) and isobaric (same nucleon number A = 252) with Nobelium-252. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 150	Isobar A = 252
92	²⁴²U
93	²⁴³Np
94	²⁴⁴Pu
95	²⁴⁵Am
96	²⁴⁶Cm	²⁵²Cm
97	²⁴⁷Bk	²⁵²Bk
98	²⁴⁸Cf	²⁵²Cf
99	²⁴⁹Es	²⁵²Es
100	²⁵⁰Fm	²⁵²Fm
101	²⁵¹Md	²⁵²Md
102	²⁵²No	²⁵²No
103	²⁵³Lr	²⁵²Lr
104	²⁵⁴Rf
105	²⁵⁵Db