Is the lattice energy of Al2O3 greater than that of AlF3?

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Discussion Overview

The discussion centers on the comparison of lattice energies between Al2O3 and AlF3, exploring the factors that influence lattice energy such as ionic charges and atomic radii. Participants consider both theoretical aspects and the implications of ionic character in these compounds.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant questions whether the lattice energy of Al2O3 is greater than that of AlF3 and seeks reasoning for either possibility.
  • Another participant suggests considering Coulomb attraction and the charges involved in the lattice energy calculations.
  • A participant outlines basic rules of lattice energy, noting that it tends to be greater with larger charges and smaller atomic radii, while expressing uncertainty about the impact of having multiple atoms of the same type in a formula.
  • A later reply reiterates the rules of lattice energy and raises the question of whether Al2O3 can be considered totally ionic, while also mentioning the importance of ion packing in the ionic case.

Areas of Agreement / Disagreement

Participants express varying degrees of understanding regarding the factors influencing lattice energy, and there is no consensus on whether Al2O3 has a greater lattice energy than AlF3. Multiple viewpoints and uncertainties remain regarding the ionic character and packing of ions.

Contextual Notes

Participants acknowledge limitations in their understanding, particularly regarding the effects of multiple identical atoms in a compound and the assumptions about ionic character in Al2O3.

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will the lattice energy of Al2O3 be greater than the lattice energy of AlF3. If so, why? If not, why?
 
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Think about Coulomb attraction and charges.
 
The basic rules of lattice energy that I've been taught are that the lattice energy is greater if the charges of the atoms are larger and if the atomic radii are smaller. I haven't done this with two or more of the same atoms (like how there are two Al and 3 O) yet so I don't know how much of a difference that makes. Hope I was able to help in a way.
 
MysticDude said:
The basic rules of lattice energy that I've been taught are that the lattice energy is greater if the charges of the atoms are larger and if the atomic radii are smaller. I haven't done this with two or more of the same atoms (like how there are two Al and 3 O) yet so I don't know how much of a difference that makes. Hope I was able to help in a way.
What you say, assuming Al2O3 is totally ionic. Is it? Furtermore, in the ionic case, you also have to consider the kind of packing of ions.
 

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