Given below are two statements:

Statement I: The correct order of first ionization enthalpy of Li, Na, F and Cl is Na

Question

Given below are two statements:

Statement I: The correct order of first ionization enthalpy of Li, Na, F and Cl is Na < Li < Cl < F.

Statement II: The correct order of negative electron gain enthalpy of Li, Na, F and Cl is Na < Li < F < Cl.

Choose the correct answer:

Canvas Classes · Accepted Answer

Strategy:
 Identify trends: Ionization Enthalpy () increases across a period and decreases down a group. Electron Gain Enthalpy () becomes more negative across a period, except for an anomaly between the  and  periods.

Step 1: Evaluate Statement I (IE)
- Order: .
- Across period:  and .
- Down group:  and .
- Combining these: . (True)

Step 2: Evaluate Statement II (EGE)
- Generally,  becomes more negative towards Chlorine.
- Anomaly: Chlorine has a more negative  than Fluorine because the smal

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