Boron-17
Properties and data of the isotope 17B.
See also: list of Boron isotopes.
General data
Name of the isotope:Boron-17; B-17Symbol:17B or 175BMass number A:17 (= number of nucleons)Atomic number Z:5 (= number of protons)Neutrons N:12Isotopic mass:17.04693(22) u (atomic weight of Boron-17)Nuclide mass:17.0441871 u (calculated nuclear mass without electrons)Mass excess:43.71501 MeVMass defect:0.096174152 u (per nucleus)Nuclear binding energy:89.58564554 MeV (per nucleus)
5.26974386 MeV (average binding energy per nucleon)Separation energy:SN = 1.47(21) MeV (first neutron)
SP = 21.02(26) MeV (first proton)Half-life:5.08(5) msDecay constant λ:136.44629538582 s-1Specific activity α:4.833522415470 × 10+24 Bq g-1
1.306357409586 × 10+14 Ci g-1Spin and parity:
(nuclear angular momentum)(3/2-)Magnetic dipole moment:μ(μN) = +2.55(2)Quadrupole moment Q:0.0385(15) barn (100 fm2)Nuclear g-factor:gl = 1.7Year of discovery:1973
Radioactive Decay
Half-life T½ = 5.08(5) ms respectively 5.08 × 10-3 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
β- | 17C | 22.1 % | | |
β-, n | 16C | 63.0 % | | |
β-, 2n | 15C | 11.0 % | | |
β-, 3n | 14C | 3.5 % | | |
β-, 4n | 13C | 0.40 % | | |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 12) and isobaric (same nucleon number A = 17) with Boron-17. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 12 | Isobar A = 17 |
4 | 16Be | |
5 | 17B | 17B |
6 | 18C | 17C |
7 | 19N | 17N |
8 | 20O | 17O |
9 | 21F | 17F |
10 | 22Ne | 17Ne |
11 | 23Na | 17Na |
12 | 24Mg | |
13 | 25Al | |
14 | 26Si | |
15 | 27P | |
16 | 28S | |
17 | 29Cl | |
18 | 30Ar | |
External data and identifiers
Last update: 2023-11-06
Perma link: https://www.chemlin.org/isotope/boron-17
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