The best replacement for covalent bonds is ionic bonds.


The best alternatives to covalent bonds are rated as following:
★★★★★  ionic bonds
★★★  hydrogen bonds
★  polar covalent bonds
★  metallic bonds
★  non covalent bonds
★  nonpolar covalent bonds
★  metallic
  intermolecular forces
  hydrogen bonds stronger
  ionic
  noncovalent bonds

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Speaking about covalent bonds, one probably shouldn't forget about nearby substances.

Other search terms related to covalent bonds and their ratings are:

★★★★★ nearby substances
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covalent bonds
ionic bonds
hydrogen bonds