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Electronegativity values of some element...

Electronegativity values of some elements are given. Using these values, find whether the following compounds are ionic or covalent.
(Electronegativity of `Ca=1, O=3.5, C=2.5, S=2.58,H=2.2,F=3.98`)
Water `(H_2O)`

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The correct Answer is:
Water `(H_2O)` Electronegativity difference =3.5-2.2=1.3 If the electronegativity difference is less 1.7 it forms covalent compounds.
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