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Boron (5 B) naturally occurs as isotopes 10 B and 11 B, the latter of which makes up about 80% of natural boron. There are 13 radioisotopes that have been discovered, with mass numbers from 7 to 21, all with short half-lives, the longest being that of 8 B, with a half-life of only 771.9(9) ms and 12 B with a half-life of 20.20(2) ms.
There are 14 known isotopes of the chemical element boron, of which the nuclides 10 B and 11 B are stable. /p> The atomic mass of boron is given as an average of 10.81 u, or with an interval of 10.806 to 10.821 u.
This table shows information about naturally occuring isotopes, their atomic masses, their natural abundances, their nuclear spins, and their magnetic moments. Further data for radioisotopes (radioactive isotopes) of boron are listed (including any which occur naturally) below. Isotope. Mass / Da.
There are 13 known isotopes of boron; the shortest-lived isotope is 7 B which decays through proton emission and alpha decay with a half-life of 3.5×10 −22 s. Isotopic fractionation of boron is controlled by the exchange reactions of the boron species B(OH) 3 and [B(OH) 4] −.
In nature, boron consists of a mixture of two stable isotopes— boron-10 (19.9 percent) and boron-11 (80.1 percent); slight variations in this proportion produce a range of ±0.003 in the atomic weight.
Example \(\PageIndex{3}\): Atomic mass of Boron. Boron has two naturally occurring isotopes. In a sample of boron, \(20\%\) of the atoms are \(\text{B-10}\), which is an isotope of boron with 5 neutrons and mass of \(10 \: \text{amu}\).
Isotopes of Boron. Boron-10 is the most abundant isotope of boron, accounting for approximately 19.9% of naturally occurring boron. It has a relative isotopic mass of 10 and consists of five protons and five neutrons in its nucleus. Boron-11 is the other stable isotope of boron, making up about 80.1% of naturally occurring boron.