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Predict whether the following bonds are ionic, covalent, or polar covalent based on
the bonding atoms electronegativities:

The Al-O bond in Al2O3

  • CHM -

    Take the difference of electronegativity between the two atoms.
    N to N = 3.0-3. = zero. Covalent.
    If delta EN (electronegativity) = 1.8 or 1.9 that is about 50% ionic/50% covalent.
    Between zero and 1.8 is olar covalent. We usually call those above 1.8 ionic but those very close to 1.8 or 1.9 still are polar covalent(although more ionic than covalent).

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