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Lettris is a curious tetris-clone game where all the bricks have the same square shape but different content. Each square carries a letter. To make squares disappear and save space for other squares you have to assemble English words (left, right, up, down) from the falling squares.
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Boron (B) naturally occurs in two isotopes, 10B and 11B, the latter of which makes up about 80% of natural boron. 14 radioisotopes have been discovered, with mass numbers from 6 to 21, all with short half-lives, the longest being that of 8B, with a half-life of only 770 milliseconds (ms) and 12B with a half-life of 20.2 ms. All other isotopes have half-lives shorter than 17.35 ms, with the least stable isotope being 7B, with a half-life of 150 yoctoseconds (ys). Those isotopes with mass below 10 decay into helium (via short-lived isotopes of beryllium for 7B and 9B) while those with mass above 11 mostly become carbon.
Standard atomic mass: 10.811(7) u
isotopic mass (u)
|range of natural
|8B[n 2]||5||3||8.0246072(11)||770(3) ms||β+, fission||2 4He||2+|
|10B||5||5||10.0129370(4)||Stable||3+||19.9(7)||18.929 – 20.386|
|12B||5||7||12.0143521(15)||20.20(2) ms||β− (98.4%)||12C||1+|
|β−, α (1.6%)||8Be[n 4]|
|13B||5||8||13.0177802(12)||17.33(17) ms||β− (99.72%)||13C||3⁄2−|
|β−, n (0.279%)||12C|
|14B||5||9||14.025404(23)||12.5(5) ms||β− (93.96%)||14C||2−|
|β−, n (6.04%)||13C|
|15B||5||10||15.031103(24)||9.87(7) ms||β−, n (93.6%)||14C||3⁄2−|
|β−, 2n (0.40%)||13C|
|17B[n 5]||5||12||17.04699(18)||5.08(5) ms||β−, n (63.0%)||16C||(3⁄2−)|
|β−, 2n (11.0%)||15C|
|β−, 3n (3.5%)||14C|
|β−, 4n (0.40%)||13C|
|19B[n 5]||5||14||19.06373(43)#||2.92(13) ms||β−||19C||(3⁄2−)#|
|Isotopes of beryllium||Isotopes of boron||Isotopes of carbon|
|Index to isotope pages · Table of nuclides|