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Ionization enthalpy of Li is 520 kJ mol-1 while that of F is 1681 kJ mol-1. Explain.
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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, ionization enthalpy of Li is 520 kJ mol-1 while that of F is 1681 kJ mol-1.

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