See also: List of individual Astatine isotopes (and general data sources).
General data
Name of the isotope:Astatine-214; At-214Symbol:214At or 21485AtMass number A:214 (= number of nucleons)Atomic number Z:85 (= number of protons)Neutrons N:129Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.5176470588235 (= neutron-proton ratio)Neutron excess (N-Z):44Isotopic mass:213.996372(5) u (atomic weight of Astatine-214)Nuclide mass:213.9497483 u (calculated nuclear mass without electrons)Mass excess:-3.37946 MeVMass defect:1.786529884 u (per nucleus)Nuclear binding energy:1664.14186777 MeV (per nucleus) 7.77636387 MeV (average binding energy per nucleon)Separation energy:SN = 4.872(6) MeV (first neutron) SP = 4.015(5) MeV (first proton)Half-life:558(10) nsDecay constant λ:1242199.2483153 s-1Specific activity α:3.495712873730 × 10+27 Bq g-1 9.447872631705 × 10+16 Ci g-1Spin and parity: (nuclear angular momentum)1-Year of discovery:1949
The following table shows the atomic nuclei that are isotonic (same neutron number N = 129) and isobaric (same nucleon number A = 214) with Astatine-214. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
