QQuestionChemistry
QuestionChemistry
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} }
Step 3:: For the third list, we need to arrange the atoms in order of decreasing size.
The atomic radii of I, F, and Cl are approximately 220 pm, 72 pm, and 102 pm, respectively. \boxed{ \begin{aligned} \text{I}, \text{F}, \text{Cl} & \to \text{Bigger atoms first} \ & \to \text{I, Cl, F} \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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