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 Se, Kr. Se Na, Rb, K Be, Be, Li atoms or ions in order of decreasing size 0.0.0 0.0.0 0.0.0 X 00

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**Understanding Periodic Trends in Atomic Size**

**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 |
|-----------------------|-------------------------------------------|
| Se, Kr, Se<sup>2–</sup>  | [  ] > [  ] > [  ]                       |
| Na, Rb, K             | [  ] > [  ] > [  ]                       |
| Be<sup>–</sup>, Be, Li | [  ] > [  ] > [  ]                       |

In the exercise above, you are asked to reorder the given atoms or ions based on their sizes. Consider the following points when determining the order:

1. **Sequencing Based on Atomic/Ionic Radius**:
    - Typically, atomic size increases as you move down a group on the periodic table.
    - Within a period, atomic size generally decreases from left to right.

2. **Ionic Size Considerations**:
    - Anions (negatively charged ions) are usually larger than their corresponding neutral atoms due to increased electron-electron repulsion.
    - Cations (positively charged ions) are generally smaller than their neutral atoms due to a loss of the outer electron shell reducing electron-electron repulsion.

Use the space provided in the right column to input the correct order of decreasing size for each set of atoms or ions.
Transcribed Image Text:**Understanding Periodic Trends in Atomic Size** **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 | |-----------------------|-------------------------------------------| | Se, Kr, Se<sup>2–</sup> | [ ] > [ ] > [ ] | | Na, Rb, K | [ ] > [ ] > [ ] | | Be<sup>–</sup>, Be, Li | [ ] > [ ] > [ ] | In the exercise above, you are asked to reorder the given atoms or ions based on their sizes. Consider the following points when determining the order: 1. **Sequencing Based on Atomic/Ionic Radius**: - Typically, atomic size increases as you move down a group on the periodic table. - Within a period, atomic size generally decreases from left to right. 2. **Ionic Size Considerations**: - Anions (negatively charged ions) are usually larger than their corresponding neutral atoms due to increased electron-electron repulsion. - Cations (positively charged ions) are generally smaller than their neutral atoms due to a loss of the outer electron shell reducing electron-electron repulsion. Use the space provided in the right column to input the correct order of decreasing size for each set of atoms or ions.
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