AP Chemistry
1.7 Periodic Trends
1.5 Atomic Structure and Electron Configuration
A student compares neutral alkali-metal atoms used in vapor-cell sensors. The principal energy level containing the valence electron of each atom is shown in the table.
Which of the following correctly predicts how the atomic radius changes from \(\text{Na}\) to \(\text{K}\) and explains the prediction?
| Atom | Principal energy level of the valence electron |
|---|---|
| \(\text{Li}\) | 2 |
| \(\text{Na}\) | 3 |
| \(\text{K}\) | 4 |
Which of the following correctly predicts how the atomic radius changes from \(\text{Na}\) to \(\text{K}\) and explains the prediction?
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