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题目

There are three types of chemical bonds: ______ bond, covalent bond and polar covalent bond.

There are three types of chemical bonds: ______ bond, covalent bond and polar covalent bond.

题目解答

答案

化学键主要分为离子键、共价键及极性共价键。题目中已给出“covalent bond”和“polar covalent bond”，第一种应为“ionic bond”。离子键由正负离子间静电作用形成，与共价键并列为基本化学键类型。答案：ionic

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