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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.
Boron carbide's ability to absorb neutrons without forming long-lived radionuclides (especially when doped with extra boron-10) makes the material attractive as an absorbent for neutron radiation arising in nuclear power plants. [100] Nuclear applications of boron carbide include shielding, control rods and shut-down pellets.
In a guideline issued in mid-1966, [49] the U.S. Office of the Federal Coordinator for Meteorology determined that weather data should be rounded to the nearest round number, with the "round half up" tie-breaking rule. For example, 1.5 rounded to integer should become 2, and −1.5 should become −1.
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.
In chemistry, the whole number rule states that the masses of the isotopes are whole number multiples of the mass of the hydrogen atom. [1] The rule is a modified version of Prout's hypothesis proposed in 1815, to the effect that atomic weights are multiples of the weight of the hydrogen atom. [ 2 ]
The achievement of, a generally positive feat, three times in a game, or another achievement based on the number three [6] Several: 3+ Three or more but not many. Small gross: 120 Ten dozen (10x12) [7] Great hundred: 120 Ten dozen (10x12) or six score (6x20), also known as long-hundred or twelfty [8] [9] None: 0 Zero Lakh: 100,000
The National Credit Union Administration tells consumers to use words for dollars and fractions out of 100 for cents. For example, if your check is for $19.99, you would write it out as ...
A natural number in the range of 10 126 and -10 126 is, as well as some larger numbers such as one centillion and one millinillion. zero : Optional. The value to use when the number is 0.