Calcium-50

Properties and data of the isotope ⁵⁰Ca.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

See also: List of individual Calcium isotopes (and general data sources).

General data

Name of the isotope:Calcium-50; Ca-50Symbol:⁵⁰Ca or 5020CaMass number A:50 (= number of nucleons)Atomic number Z:20 (= number of protons)Neutrons N:30Isotopic mass:49.9574992(17) u (atomic weight of Calcium-50)Nuclide mass:49.9465278 u (calculated nuclear mass without electrons)Mass excess:-39.58924 MeVMass defect:0.45894892 u (per nucleus)Nuclear binding energy:427.50816529 MeV (per nucleus)
8.55016331 MeV (average binding energy per nucleon)Separation energy:S_N = 6.3608(16) MeV (first neutron)
S_P = 17.2667(18) MeV (first proton)Half-life:13.45(5) sDecay constant λ:0.051535106361334 s^-1Specific activity α:6.333707545709 × 10⁺²⁰ Bq g^-1
17118128501.918 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:3.5168(64) femtometer fmYear of discovery:1964

Radioactive Decay

Half-life T_½ = 13.45(5) s respectively 1.345 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁵⁰Sc	100 %	4.958(15) MeV

Parent Nuclides

Direct parent isotopes are: ⁵⁰K, ⁵¹K.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 30) and isobaric (same nucleon number A = 50) with Calcium-50. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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