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化学键的表示方法——电子式
概念:在元素符号周围用“·”或“×”来表示原子的最外层电子(价电子)的式子。
【微思考】 有以下8种物质:①Ne ②HCl ③P4 ④H2O2 ⑤Na2S ⑥NaOH ⑦Na2O2 ⑧NH4Cl
请用上述物质的序号填空:
(1)不存在化学键的是 。
(2)只存在极性共价键的是 。
(3)只存在非极性共价键的是 。
(4)既存在非极性共价键又存在极性共价键的是 。
(5)只存在离子键的是 。
(6)既存在离子键又存在共价键的是 。
(7)属于离子化合物的是 。
(8)属于共价化合物的是 。
提示:(1)① (2)② (3)③ (4)④ (5)⑤
(6)⑥⑦⑧ (7)⑤⑥⑦⑧ (8)②④