What's the rule to covalent character

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The discussion centers on determining whether compounds are ionic or covalent, specifically analyzing Tetramethyl-lead(IV) ((CH3)4Pb) and Aluminium chloride (AlCl3). It concludes that while metals typically form ionic bonds with polyatomic ions, (CH3)4Pb exhibits covalent characteristics. Additionally, Aluminium chloride is classified as covalent due to its sublimation point of approximately 200°C. The conversation emphasizes the lack of strict boundaries between ionic and covalent bonds and suggests using electronegativity differences, Fajan's rules, and dipole moment calculations as indicators.

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What is the general rule to find out some compound is ionic or covalent?

For e.g: Tetramethyl-lead(IV) (CH3)4Pb, has lead metal in it.
Normally a metal bonded to a polyatomic molecule (or ion) is ionic, but i highly doubt it is the case here. I think (CH3)4Pb is covalent rather than ionic.

Another e.g is of Aluminium chloride (AlCl3) (in solid form) which was referred to-by my chemistry professor-as a covalent compound, together with the proof that it sublimes at about 200 Degrees C
 
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There are no strict boundaries between covalent and ionic bonds. You may use the differences in electronegativities, Fajan's rules, dipole moment calculations as indicators, but the cases you mentioned fall right into intermediate cases.
 

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