Bromine-90

Properties and data of the isotope ⁹⁰Br.

Content

General data

Name of the isotope:Bromine-90; Br-90Symbol:⁹⁰Br or 9035BrMass number A:90 (= number of nucleons)Atomic number Z:35 (= number of protons)Neutrons N:55Isotopic mass:89.931293(4) u (atomic weight of Bromine-90)Nuclide mass:89.9120934 u (calculated nuclear mass without electrons)Mass excess:-64.00016 MeVMass defect:0.81915350000001 u (per nucleus)Nuclear binding energy:763.03657033 MeV (per nucleus)
8.47818411 MeV (average binding energy per nucleon)Separation energy:S_N = 3.797(5) MeV (first neutron)
S_P = 12.297(5) MeV (first proton)Half-life:1.91(1) sDecay constant λ:0.36290428301568 s^-1Specific activity α:2.455573832578 × 10⁺²¹ Bq g^-1
66366860339.957 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:1959

Radioactive Decay

Half-life T_½ = 1.91(1) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁹⁰Kr	74.8 %	10.959(4) Mev
β^-, n	⁸⁹Kr	25.2 %	4.464(4) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 55) and isobaric (same nucleon number A = 90) with Bromine-90. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 55	Isobar A = 90
30	⁸⁵Zn
31	⁸⁶Ga
32	⁸⁷Ge	⁹⁰Ge
33	⁸⁸As	⁹⁰As
34	⁸⁹Se	⁹⁰Se
35	⁹⁰Br	⁹⁰Br
36	⁹¹Kr	⁹⁰Kr
37	⁹²Rb	⁹⁰Rb
38	⁹³Sr	⁹⁰Sr
39	⁹⁴Y	⁹⁰Y
40	⁹⁵Zr	⁹⁰Zr
41	⁹⁶Nb	⁹⁰Nb
42	⁹⁷Mo	⁹⁰Mo
43	⁹⁸Tc	⁹⁰Tc
44	⁹⁹Ru	⁹⁰Ru
45	¹⁰⁰Rh	⁹⁰Rh
46	¹⁰¹Pd	⁹⁰Pd
47	¹⁰²Ag
48	¹⁰³Cd
49	¹⁰⁴In
50	¹⁰⁵Sn
51	¹⁰⁶Sb
52	¹⁰⁷Te
53	¹⁰⁸I
54	¹⁰⁹Xe