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- ...or materials. The valence electron count of GaAs is the same as a pair of Si atoms but the band structure is completely different, which results distinc ...ic_poisoning_from_drinking_water|Arsenicosis]] was reported in [[Nakhon Si Thammarat]], [[Thailand]] in 1987, and the dissolved arsenic in the [[Chao Phraya Riv51 KB (7,314 words) - 21:34, 20 September 2010