Answer and explanation

Correct answer: D. NaCl

  1. Step 1: NaCl 由金屬 Na 與非金屬 Cl 組成,電子轉移形成離子;其餘三者由非金屬以共用電子對結合。
Answer
NaCl.
Why not the others: HCl、CO₂、CH₄不符合題意。

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