Discussion
The alkali metal with the highest first enthalpy of ionization is
Answer: E
The alkali metal with the highest first ionization enthalpy is Li.
Down group 1 the atomic radius increases and the outer s electron is held less tightly, so the first ionization enthalpy falls: Li (520) > Na (496) > K (419) > Rb (403) > Cs (376 kJ mol−1).
Lithium, the smallest atom, has the highest value, and caesium the lowest.
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