In the ionic compounds LiF, NaCl,KBr, and RbI the measured cation-anion distance

Question

In the ionic compounds LiF, NaCl,KBr, and RbI the measured cation-anion distances are 2.01 AA (Li - F), 2.82 AA (Na - Cl), 3.30 AA (K - Br), and 3.67 AA (Rb - I), respectively.

Part A :

1-Predict the cation-anion distance using the values of ionic radii
d{Li - F}, d{Na - Cl}, d{K- Br}, d{Rb - I}


Part B :

1-What estimates of the cation-anion distance would you obtain for these four compounds using bonding atomic radii?
d{Li - F}, d{Na - Cl}, d{K- Br}, d{Rb - I}

2-Are these estimates as accurate as the estimates using ionic radii?

Explanation / Answer

Part A: dLi?F, dNa?Cl, dK?Br, dRb?I = 2.09,2.83,3.34,3.72 No Part B: dLi?F, dNa?Cl, dK?Br, dRb?I = 2.05,2.53,3.10,3.44No, the estimates using ionic radii are more accurate.

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