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Question
Answer the following.
Ionization enthalpy of Li is 520 kJ mol-1 while that of F is 1681 kJ mol-1. Explain.
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Solution
- Both Li and F belong to period 2.
- Across a period, the screening effect is the same while the effective nuclear charge increases.
- As a result, the outer electron is held more tightly, and therefore, the ionization enthalpy increases across a period.
- Hence, F will have higher ionization enthalpy than Li.
Thus, the ionization enthalpy of Li is 520 kJ mol-1 while that of F is 1681 kJ mol-1.
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