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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.
Hints: Electronegativity values: C- 2.5, O-3.5, Na-0.9, Cl-3.16, Mg-1.31
a)`NaCl`
b)`MgCl_2`

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a) Ionic bond
b) Covalent bond
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