Scandium-51

Properties and data of the isotope ⁵¹Sc.

Content

General data

Name of the isotope:Scandium-51; Sc-51Symbol:⁵¹Sc or 5121ScMass number A:51 (= number of nucleons)Atomic number Z:21 (= number of protons)Neutrons N:30Isotopic mass:50.953592(21) u (atomic weight of Scandium-51)Nuclide mass:50.942072 u (calculated nuclear mass without electrons)Mass excess:-43.22877 MeVMass defect:0.470681152 u (per nucleus)Nuclear binding energy:438.436669 MeV (per nucleus)
8.59679743 MeV (average binding energy per nucleon)Separation energy:S_N = 6.753(25) MeV (first neutron)
S_P = 10.298(20) MeV (first proton)Half-life:12.4(1) sDecay constant λ:0.055898966174189 s^-1Specific activity α:6.732628964516 × 10⁺²⁰ Bq g^-1
18196294498.692 Ci g^-1Spin and parity:
(nuclear angular momentum)(7/2)-Year of discovery:1966

Radioactive Decay

Half-life T_½ = 12.4(1) s respectively 1.24 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁵¹Ti	100 %	6.504(20) MeV
β^-, n	⁵⁰Ti	?	0.132(20) MeV

Parent Nuclides

Direct parent isotope is: ⁵¹Ca.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 30) and isobaric (same nucleon number A = 51) with Scandium-51. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 30	Isobar A = 51
13	⁴³Al
14	⁴⁴Si
15	⁴⁵P
16	⁴⁶S
17	⁴⁷Cl	⁵¹Cl
18	⁴⁸Ar	⁵¹Ar
19	⁴⁹K	⁵¹K
20	⁵⁰Ca	⁵¹Ca
21	⁵¹Sc	⁵¹Sc
22	⁵²Ti	⁵¹Ti
23	⁵³V	⁵¹V
24	⁵⁴Cr	⁵¹Cr
25	⁵⁵Mn	⁵¹Mn
26	⁵⁶Fe	⁵¹Fe
27	⁵⁷Co	⁵¹Co
28	⁵⁸Ni	⁵¹Ni
29	⁵⁹Cu
30	⁶⁰Zn
31	⁶¹Ga
32	⁶²Ge
33	⁶³As
34	⁶⁴Se