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Question
Among the alkali metals, the metal with the highest ionisation potential is:
Among the alkali metals, the metal with the highest ionisation potential is:
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Solution
The correct option is B Li
On moving down the group, the atomic number of alkali metals increases. This increases the atomic size, nuclear charge and the screening effect. Hence the ionization energies decrease from lithium to caesium.
Hence, lithium has the highest ionization enthalpy among the alkali metals.
On moving down the group, the atomic number of alkali metals increases. This increases the atomic size, nuclear charge and the screening effect. Hence the ionization energies decrease from lithium to caesium.
Hence, lithium has the highest ionization enthalpy among the alkali metals.
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