Scandium-45 is a stable isotope of the chemical element scandium, which has 24 neutrons in its atomic nucleus in addition to the element-specific 21 protons; the sum of the number of these atomic nucleus building blocks results in a mass number of 45.
The first detection of the nuclide was achieved using accelerated anode rays with a spectrograph in 1923 [1].
See also: List of individual Scandium isotopes (and general data sources).
General data
Name of the isotope:Scandium-45; Sc-45Symbol:45Sc or 4521ScMass number A:45 (= number of nucleons)Atomic number Z:21 (= number of protons)Neutrons N:24Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.1428571428571 (= neutron-proton ratio)Neutron excess (N-Z):3Isotopic mass:44.955908(5) u (atomic weight of Scandium-45)Nuclide mass:44.944388 u (calculated nuclear mass without electrons)Mass excess:-41.07143 MeVMass defect:0.41637565600001 u (per nucleus)Nuclear binding energy:387.85142531 MeV (per nucleus) 8.61892056 MeV (average binding energy per nucleon)Separation energy:SN = 11.3276(19) MeV (first neutron) SP = 6.8926(7) MeV (first proton)Half-life:stableSpin and parity: (nuclear angular momentum)7/2-Magnetic dipole moment:μ(μN) = +4.75400(8)Charge radius:3.5459(25) femtometer fmMirror nucleus:Chromium-45Year of discovery:1923
The following table shows the atomic nuclei that are isotonic (same neutron number N = 24) and isobaric (same nucleon number A = 45) with Scandium-45. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
