Constants Periodic Table In the ionic compounds LiF, NaCI, KBr, and RbI, the mea

Question

Constants Periodic Table In the ionic compounds LiF, NaCI, KBr, and RbI, the measured cation-anion distances are 2.01 A (Li- F), 2.82 A (Na C1), 3.30 A (K -Br), and 3.67 A (Rb-I), respectively Group 1A Groun 2A Groun 3AGroun Groun 7A A table compares sizes of atoms t their cation or anion 0.90 0.59 0.41 1.26 1.19 Li 1.28 0.96 0.84 0.66 0.57 Al3+ 0.68 Cl 1.67 0.86 1.70 Mg 1.41 Al 1.21 Cl 1.02 1.66 1.05 Ca2+ 1.14 Ga3+ 0.76 1.52 1.84 1.82 2.03 1.76 1.22 1.20 1.20 Sr2+ 1.32 In3+ 0.94 1.66 2.07 2.06 2.20 1.95 1.42 1.38 1.39 cation anon = neutral atom

Explanation / Answer

Part A::

LiF = 2.09 ang

NaCl= 2.83 ang

KBr= 3.34 ang

Rb-I= 3.72 ang

Part B:

LiF = 0.08 ang

NaCl= 0.01 ang

KBr= 0.04

Rb-I= 0.05

Part C:

LiF = 1.85 ang

NaCl= 2.68 ang

KBr= 3.23 ang

Rb-I= 3.59 ang

Part D:

No, the estimates using ionic radii are more accurate

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