AP Chemistry
1.7 Periodic Trends
1.5 Atomic Structure and Electron Configuration
To estimate steric interactions in a porous material, a student compares the electron-cloud radii of the species shown in the table.
Which statement gives the correct ordering of electron-cloud radii from greatest to least and the best justification?
| Species | Number of protons | Number of electrons |
|---|---|---|
| \(\text{S}^{2-}\) | 16 | 18 |
| \(\text{Ar}\) | 18 | 18 |
| \(\text{Ca}^{2+}\) | 20 | 18 |
Which statement gives the correct ordering of electron-cloud radii from greatest to least and the best justification?
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