21B (other)
21B may refer to: * 2-1B, a droid character in ''Star Wars'' * Boron-21 (B-21 or 21B), an isotope of boron See also * B21 (other) B21 may refer to: Places * Kepong–Selayang Highway (Selangor state route B21), Malaysia * Autovía B-21, Spain; a motorway * Harumi Chūō (station code B21), Tokyo BRT, Tokyo, Japan * Mikamo Station (station code B21), Higashimiyoshi, Miyoshi, T ...

2-1B
In the ''Star Wars'' space opera franchise, a droid is a fictional robot possessing some degree of artificial intelligence''.'' The term is a clipped form of "android", a word originally reserved for robots designed to look and act like a human. The word "android" itself stems from the New Latin word "androīdēs", meaning "manlike", itself from the Ancient Greek ''ἀνδρος'' (andrós) (genitive of ''ἀνήρ'' (anḗr), "man (adult male)" or "human being") + ''-ειδής'' (-eidḗs), itself from ''εἶδος'' (eîdos, "form, image, shape, appearance, look"). Writer and director George Lucas first used the term "droid" in the second draft script of ''Star Wars,'' completed 28 January 1975. However, the word does have a precedent: science fiction writer Mari Wolf used the word in her story "Robots of the World! Arise!" in 1952. It's not known if Lucas knew of this reference when he wrote ''Star Wars'', or if he came up with the term independently. The word "droid" has ...
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Boron-21
Boron (5B) naturally occurs as isotopes and , 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 , with a half-life of only and with a half-life of . All other isotopes have half-lives shorter than . Those isotopes with mass below 10 decay into helium (via short-lived isotopes of beryllium for and ) while those with mass above 11 mostly become carbon. List of isotopes , - , ?This isotope has not yet been observed; given data is inferred or estimated from periodic trends. , style="text-align:center" , 5 , style="text-align:center" , 1 , , p-unstable , 2p? , ? , 2−# , , , - , , style="text-align:center" , 5 , style="text-align:center" , 2 , , [] , p , Subsequently decays by double proton emission to for a net reaction of → + 3 , (3/2−) , , , - , Has 1 halo nucleus, halo proton , style= ...
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