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Incorrect order of properties given in p...

Incorrect order of properties given in parenthesis are

A

`Cl gt S gt F gt O" (Electron affinity)"`

B

`O gt F gt B gt C (IE_(2))`

C

`N gt O gt P gt S (IE_(1))`

D

`O gt C gt B gt N "(Electron affintiy)"`

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the incorrect order of properties (electron affinity and ionization energy), we will analyze the trends for both properties step by step. ### Step 1: Understanding Electron Affinity - **Definition**: Electron affinity is the energy change that occurs when an electron is added to a neutral atom. - **Trend**: - **Across a Period**: Electron affinity generally increases from left to right due to increasing nuclear charge. - **Down a Group**: Electron affinity generally decreases due to increasing atomic size and shielding effect. ### Step 2: Analyzing Electron Affinity for Given Elements - **Elements**: Oxygen (O), Sulfur (S), Fluorine (F), Chlorine (Cl). - **Expected Trend**: - F > Cl (Fluorine should have a higher electron affinity than Chlorine) - O > S (Oxygen should have a higher electron affinity than Sulfur) - **Actual Trend**: - Due to inter-electronic repulsions in small atoms, the correct order is Cl > F and S > O. ### Step 3: Understanding Ionization Energy - **Definition**: Ionization energy is the energy required to remove an electron from a neutral atom. - **Trend**: - **Across a Period**: Ionization energy generally increases from left to right due to increasing nuclear charge. - **Down a Group**: Ionization energy generally decreases due to increasing atomic size. ### Step 4: Analyzing Ionization Energy for Given Elements - **Elements**: Oxygen (O), Nitrogen (N), Fluorine (F), and others. - **Expected Trend**: - O > N (Oxygen should have a higher ionization energy than Nitrogen due to its electronic configuration). - **Actual Trend**: - N has a higher ionization energy than O because Nitrogen has a half-filled p-orbital configuration (2s² 2p³), making it more stable and harder to remove an electron. ### Step 5: Conclusion - **Incorrect Order**: The question asks for the incorrect order of properties. Based on our analysis: - For electron affinity, the incorrect order is Cl > F instead of F > Cl. - For ionization energy, the incorrect order is O > N instead of N > O. ### Final Answer The incorrect order of properties given in parenthesis is: 1. Electron Affinity: Cl > F (should be F > Cl) 2. Ionization Energy: O > N (should be N > O)
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