QQuestionChemistry
QuestionChemistry
Identify the elements correctly shown by decreasing radii size.
A. $\mathrm{N}^{3 -}>\mathrm{N}$
B. $\mathrm{Cu}^{2 +}>\mathrm{Cu}^{+}$
C. $\mathrm{K}^{+}>\mathrm{K}$
D. $\mathrm{N}>\mathrm{N}^{3 -}$
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Answer
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Step 1:Let's solve this step by step by analyzing the trends in atomic and ionic radii.
Step 2:: Understanding Atomic and Ionic Radii
- Atomic radius is the distance from the nucleus to the outermost electron - Ionic radius depends on the number of electrons and the nuclear charge - Gaining or losing electrons affects the size of an atom/ion
Step 3:: Analyzing Nitrogen Species
- Therefore, $$\mathrm{N}^{3-} > \mathrm{N}
- \mathrm{N}^{3 -} (ion): Has 10 electrons (3 extra) - When an atom gains electrons, it becomes larger due to increased electron-electron repulsion
Step 4:: Analyzing Copper Species
- Therefore, $$\mathrm{Cu}^{2+} > \mathrm{Cu}^{+}
- \mathrm{Cu}^{2 +} (ion): Has lost two electrons - Losing electrons reduces atomic size due to decreased electron-electron repulsion
Step 5:: Analyzing Potassium Species
- Therefore, $$\mathrm{K}^{+} < \mathrm{K}
- \mathrm{K}^{+} (ion): Has lost one electron - Losing an electron reduces atomic size
Final Answer
Option A is correct. \mathrm{N}^{3 -} > \mathrm{N} represents the correct trend in radii size.
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