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electronegativity of ionic bonding
/= 1.8 units
electronegativity of polar covalent bonding
0.5-1.7 units
electronegativity of non-polar covalent bonding
0.1-0.4 units
electronegativity of covalent bonding
0 units
non-polar covalent bonds
occurs between atoms with no electronegativity difference.
Note 
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