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 |
| --- | --- |
| Be, Be⁺, Li | Li, Be, Be⁺ |
| Br, I, Cl | I, Br, Cl |
| Cl, Na, S | ☐, ☐, ☐ |
☐ ☐ ☐
☑ ☐ ☐
☒ ☑
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Answer
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Step 1:: For the first list, Be (Beryllium) has an atomic radius of 111 pm, Be+ (Beryllium ion) has an ionic radius of 31 pm, and Li (Lithium) has an atomic radius of 157 pm.
Since Be+ is a cation, it has a smaller size than both Be and Li. Therefore, the list in order of decreasing size is Li, Be, Be+.
Step 2:: For the second list, Br (Bromine) has an atomic radius of 196 pm, I (Iodine) has an atomic radius of 220 pm, and Cl (Chlorine) has an atomic radius of 181 pm.
Therefore, the list in order of decreasing size is I, Br, Cl.
Step 3:: For the third list, Cl (Chlorine) has an atomic radius of 181 pm, Na (Sodium) has an atomic radius of 186 pm, and S (Sulfur) has an atomic radius of 104 pm.
Therefore, the list in order of decreasing size is Cl, Na, S.
Final Answer
| atoms or ions | atoms or ions in order of decreasing size | | --- | --- | | Be, Be⁺, Li | Li, Be, Be⁺ | | Br, I, Cl | I, Br, Cl | | Cl, Na, S | Cl, Na, S |
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