How to calculate percentage (%) ionic character in covalent compounds?

 Henry & Smith equation:

The percentage ionic character in covalent compound arises due to the electronegative difference of bonding atoms. And percentage ionic character of covalent bond calculates by Henry and Smith equation;

Solved Questions:

(2) A given compound AB whose electronegative difference is 1.9 . Atomic radius of A and B are 4 and 2 Angstroms the distance between A and B means dA-B is ?

(2) The C–C single bond length is 1.54 Angstroms and that of Cl–Cl is 1.98 Angstroms. If the electronegativity of Cl and C are 3.0 and 2.5 respectively, the C–Cl bond-length will be equal to ?

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