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化學式的寫法:
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化學式的寫法:. 陽(正)離子在前面,陰(負)離子在後面。 陽離子以 表示,陰離子以 表示。 在依正負離子總電量相等,決定各離子的個數。 例如: (1)Na + 和 Cl - 可形成 NaCl 。 (2)Mg 2+ 和 Cl - 可形成 MgCl 2 。 (3)Al 3+ 和 Cl - 可形成 AlCl 3 。 (4)Mg 2+ 和 O 2- 可形成 MgO 。 (5)Al 3+ 和 O 2- 可形成 Al 2 O 3 。. Na +. Cl -. NaCl. Mg 2+. O 2-. MgO. Na +. O 2-. Mg 2+. Na +.
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化學式的寫法:
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