Bromine Isotopes

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Bromine Isotopes

The concept of isotopes is one of the most vital one in the field of chemistry. In this article, we shall know which are the stable and unstable bromine isotopes in detail.

Bromine is an important chemical element and has a symbol Br. The chemical properties of bromine are quite unique and distinguished as compared to those of other elements. Here are some of the notable bromine properties which you should know:

  • The atomic number of bromine is 35
  • Elemental bromine is toxic as well as corrosive; whereas free bromine is crystalline in nature and does not have a color
  • It is more reactive than iodine, but less reactive than chlorine
  • It is highly soluble in acetic acid and carbon disulphide and is known to have intense and strong bleaching action with several other elements
  • It has just 2 stable isotopes whereas there are around 23 radioisotopes

Though the main focus of this article is on its isotopes,we can understand that better only after we are clear with the meaning of the term ‘isotopes’.


The concept of isotopes was first suggested by Frederick Soddy way back in 1913 after studying radioactive decay chains thoroughly. Isotopes are defined as the variants of atoms of an elements which have unequal number of neutrons in them. If a particular element has two isotopes, than the mass number, or the number of nucleons in them, will not be the same. Now, you may want to know what exactly is the meaning of ‘nucleons’. Nucleons is the sum of total number of protons and total number of neutrons of the element.

So, Nucleons = (Number of Protons) + (Number of neutrons). If an element has isotopes which are radioactive in nature, then they are called radioisotopes. Tin is the element which has maximum number of stable isotopes which is 10. 79Br and 81Br are the two stable isotopes of bromine.

Isotopes of Bromine

Bromine isotopes Br-79 and Br-81 have great application sin the field of medicine. While Br-81 has been useful for diagnostic purposes, Br-79 is helpful in radiotherapy after getting decayed into the radioisotope Br-77. Another known fact about bromine isotopes is that most of them are results of fission.

Nuclide Symbol Neutron Number Isotopic Mass Half Life
66Br 31 Not known Not known
67Br 32 66.96 Not known
68Br 33 67.95 <1.2 micro sec
69Br 34 68.95 <24 nano sec
70Br 35 69.94 79.1 milli sec
71Br 36 70.93 21.4 sec
72Br 37 71.93 78.6 seconds
73Br 38 3.4 72.9 min
74Br 39 73.92 25.4 min
75Br 40 74.92 96.7 min
76Br 41 75.92 16.2 hours
77Br 42 76.92 57.036 hours
78Br 43 77.92 6.46 min
79Br 44 78.91 Stable
80Br 45 79.91 17.68 min
81Br 46 80.91 Stable
82Br 47 81.91 35.28 hours
83Br 48 82.91 2.40 hours
84Br 49 83.91 31.80 min
85Br 50 84.91 2.90 min
86Br 51 85.91 55.1 sec
87Br 52 86.92 55.65 sec
88Br 53 87.92 16.29 sec
89Br 54 88.92 4.40 sec
90Br 55 89.93 1.91 sec
91Br 56 90.93 541 milli sec
92Br 57 91.93 0.34 sec
93Br 58 92.94 102 milli sec
94Br 59 93.94 70 milli sec
95Br 60 94.95 >300 nanosec
96Br 61 95.95 >300 nanosec
97Br 62 96.96 >300 nanosec

Here are some more bromine isotopes and their half-life that may interest you.

Some More
Nuclide Symbol Half Life
70mBr 2.2 seconds
72mBr 10.6 seconds
74mBr 46 minutes
76mBr 1.31 seconds
77mBr 4.28 minutes
78mBr 119.2 microseconds
79mBr 4.86 seconds
80mBr 4.42 hours
81mBr 34.6 microseconds
82mBr 6.13 minutes
83mBr 700 nanoseconds
84m1Br 6.0 minutes
84m2Br <140 nanoseconds
88mBr 5.4 microseconds

In general, the concept of isotopes is important to understand principles and fundamentals of advanced chemistry. So, my suggestion to those planning a career in chemistry would be to get your basics right so that you can go deep into this interesting subject and understand it thoroughly.

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