QQuestionAnatomy and Physiology
QuestionAnatomy and Physiology
Re-order each list in the table below, if necessary, so that the atoms or ions in it are listed in order of decreasing size.
| Atoms or Ions | Atoms or Ions in order of decreasing size |
| --- | --- |
| N, Be, F | |
| $\mathrm{B}^{2 +}, \mathrm{B}, \mathrm{Be}$ | |
| I, F, Cl | |
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Answer
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Step 1: For the first list, we need to arrange the atoms in order of decreasing size.
The atomic radii of Be, N, and F are approximately 112 pm, 75 pm, and 64 pm, respectively. \boxed{ \begin{aligned} \text{N, Be, F} & \to \text{Bigger atoms first} \ & \to \text{F, N, Be} \end{aligned} }
Step 2: For the second list, we need to arrange the ions in order of decreasing size.
Note that the cation $\text{B}^{2 +}$ has a smaller radius than the neutral B atom due to the increased effective nuclear charge. \boxed{ \begin{aligned} \text{B}^{2 +}, \text{B}, \text{Be} & \to \text{Bigger ions first} \ & \to \text{Be, B, B}^{2 +} \end{aligned} }
Final Answer
| Atoms or Ions | Atoms or Ions in order of decreasing size | | --- | --- | | N, Be, F | F, N, Be | | $\text{B}^{2 +}, \text{B}, \text{Be}$ | $\text{Be}, \text{B}, \text{B}^{2 +}$ | | I, F, Cl | I, Cl, F |
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