ch4 等分子中的 碳原子 直线型 becl2 hgcl2 平面三角型 bf3 bcl3
未来会是sic和gan的天下吗?
crystal structure of compound 3.
there is no forbidden gap between the valence band and
structures 1) 1 se 4 br = 6 4×7 = 34 valence electrons
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