Ionic and metallic bonds are universally weaker than covalent bonds
The claim that ionic and metallic bonds are universally weaker than covalent bonds is refuted, as bond strengths vary widely by specific system and many ionic and metallic interactions match or exceed the strength of typical covalent bonds.
The retrieved literature contains multiple counterexamples and physical descriptions showing that bond strength depends on the specific ionic, metallic, or covalent system, and ionic dissociation energies can reach very high values (up to 70 kcal/mol as noted in Paper 0). Thus, the universality of the claim is false.
Borocci S, Grandinetti F, Sanna N, Zazza C. A Theoretical Investigation on the Hydrogen Bond Based on the GLED Method of Bonding Analysis.. 2026. https://doi.org/10.1002/jcc.70348
Paper 0 shows that very strong ionic bonds can achieve dissociation energies up to 70 kcal/mol, overlapping or exceeding many covalent interactions.
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Qu N, Zhou W, Zhang W, Liu Y, Zheng L, Cao D, Tan M, Zhu J, Zhang X. Research Progress and Prospects of Ultra-High-Temperature Ceramics: Experimentation, Multiscale Simulation and Data-Driven Design.. 2026. https://doi.org/10.3390/nano16110693
Paper 5 discusses ultra-high-temperature ceramics featuring strong covalent-metallic bonding that endows them with exceptionally high melting points and stability, demonstrating the high strength of metallic bonding.
Zakiyeva ZY, Tolegen UZ, Inerbaev TM, Kotomin E, Abuova AU, Akilbekov B, Amankeldiyeva A, Zhomartova A, Popov AI, Abdirashev OK, Abuova FU. Atomic-Scale Understanding of Doping Effects in BaTiO<sub>3</sub> in the Presence of Water: Implications for Photocatalytic Water Splitting.. 2026. https://doi.org/10.3390/ma19112336
Paper 10 compares covalent and ionic interactions in doped materials, illustrating that ionic interactions can be extremely robust and do not universally rank below covalent bonds.
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