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Boron has two naturally occurring and stable isotopes, 11 B (80.1%) and 10 B (19.9%). The mass difference results in a wide range of δ 11 B values, which are defined as a fractional difference between the 11 B and 10 B and traditionally expressed in parts per
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.
Isotopes of boron (5 B) Main isotopes ... link1 = product isotope page | pn1 =! product mass number ... The number willbe rounded to 3 sigfig. When dm-% ...
The value published can have an uncertainty, like for neon: 20.1797(6), or can be an interval, like for boron: [10.806, 10.821]. Next to these 84 values, IUPAC also publishes abridged values (up to five digits per number only), and for the twelve interval values, conventional values (single number values).
For other isotopes, the isotopic mass is usually within 0.1 u of the mass number. For example, 35 Cl (17 protons and 18 neutrons) has a mass number of 35 and an isotopic mass of 34.96885. [7] The difference of the actual isotopic mass minus the mass number of an atom is known as the mass excess, [8] which for 35 Cl is –0.03115.
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