Which of the following has the least ionizati | vedclass

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(B) Ionization potential decreases down a group due to an increase in atomic size and shielding effect.$Li$ and $Cs$ both belong to Group $1$ (Alkali

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$Cs$

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(B) Ionization potential decreases down a group due to an increase in atomic size and shielding effect.$Li$ and $Cs$ both belong to Group $1$ (Alkali metals).Since $Cs$ has a much larger atomic size compared to $Li$,the valence electron in $Cs$ is further from the nucleus and experiences a weaker electrostatic force of attraction.Therefore,$Cs$ has the least ionization potential among the given options.

Which of the following has the least ionization potential?

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