P3- has a smaller ionic radius than K*. True O False

Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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### Ionic Radius Comparison

**Question:**  
P³⁻ has a smaller ionic radius than K⁺.

**Options:**
- True
- False

### Explanation:

In comparing ionic radii, positive ions (cations) are typically smaller than their neutral atoms because they lose electrons, reducing electron-electron repulsion and allowing the remaining electrons to be drawn closer to the nucleus. Negative ions (anions), on the other hand, are larger than their neutral atoms because gaining electrons increases electron-electron repulsion, causing the electrons to spread out more.

For phosphide ion (P³⁻), it has gained three electrons, which significantly increases its size compared to its neutral atom, phosphorus (P).

For potassium ion (K⁺), it has lost one electron, which makes it smaller compared to its neutral atom potassium (K).

Hence, in this case, P³⁻ will have a larger ionic radius than K⁺. Therefore, the correct answer to this question would be **False**.

---

This content helps students understand the concept of ionic radii and how the gaining or losing of electrons affects the size of an ion relative to its neutral counterpart.
Transcribed Image Text:### Ionic Radius Comparison **Question:** P³⁻ has a smaller ionic radius than K⁺. **Options:** - True - False ### Explanation: In comparing ionic radii, positive ions (cations) are typically smaller than their neutral atoms because they lose electrons, reducing electron-electron repulsion and allowing the remaining electrons to be drawn closer to the nucleus. Negative ions (anions), on the other hand, are larger than their neutral atoms because gaining electrons increases electron-electron repulsion, causing the electrons to spread out more. For phosphide ion (P³⁻), it has gained three electrons, which significantly increases its size compared to its neutral atom, phosphorus (P). For potassium ion (K⁺), it has lost one electron, which makes it smaller compared to its neutral atom potassium (K). Hence, in this case, P³⁻ will have a larger ionic radius than K⁺. Therefore, the correct answer to this question would be **False**. --- This content helps students understand the concept of ionic radii and how the gaining or losing of electrons affects the size of an ion relative to its neutral counterpart.
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