Which of the following has the greatest distance between Ions?

Question

BlackTom AI · Accepted Answer

The prompt asks: 'Which of the following has the greatest distance between ions?' but the provided data shows an answer of 'CaSe' and an empty list for answer_options. This means the set of possible choices to compare is missing, so we cannot directly determine which option yields the greatest interionic distance.

What we can do is outline the reasoning you’d use if you had the full options and how to evaluate them:

- Interionic distance in a solid lattice generally correlates with the sum of the ionic radii of the cation and anion in contact along the lattice direction. Larger ions tend to produce a larger distance between alternating ions.
- If you compare compounds with the same charge and similar crystal structure, the one containing larger ions (larger ionic radii) will typically have a larger distance between neighboring ions. For example, replacing a smaller anion with a larger one (keeping the cation fixed) tends to increase the interionic distance.
- Charge density also matters: ions with higher charge density (smaller size for a given charge) pull closer together, but when you compare ions of the same charge states, the size difference is usually the dominant factor for distance.

Given the specific candidate 'CaSe' in the lone answer field:
- Calcium selenide (CaSe) would involve Ca2+ and Se2-. Selenium is larger than sulfur, so Se2- has a larger radius than S2-. If you were to compare CaSe to CaS (hypothetical alternative option), CaSe would generally have a larger Ca–Se distance than Ca–S because Se2- is larger than S2- while the Ca2+ radius remains fixed.
- If other options included ions with much smaller radii (e.g., compounds with Li+ or F−), those would typically yield shorter interionic distances compared to those with larger anions or cations.

Because the actual list of options is missing, we cannot definitively rank all choices against each other. In a complete question, you would:
- list each option, identify the cation and anion, note their ionic radii, and judge which pair yields the largest sum of radii.
- consider any exceptions due to crystal structure differences (though many introductory problems assume similar structures like rock salt or zinc blende for comparability).

If you can provide the full set of answer options, I can walk through each one and determine which compound would have the greatest distance between its ions, using the same reasoning steps and comparing ionic radii directly.

CHEM 110 Section 3 (PM) SP25 Pre-Lecture 13 Quiz C06-1-3

Which of the following has the greatest distance between Ions?

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