Which of the following elements will have the | vedclass

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(B) The first ionisation energy decreases down a group as the atomic size increases and the valence electron is further from the nucleus.$Mg$ and $Ca$

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$Rb$

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(B) The first ionisation energy decreases down a group as the atomic size increases and the valence electron is further from the nucleus.$Mg$ and $Ca$ belong to Group $2$,while $Li$ and $Rb$ belong to Group $1$.Among the given elements,$Rb$ $(Rubidium)$ is in the $5^{th}$ period of Group $1$,making it the largest atom with the weakest attraction for its valence electron.Therefore,$Rb$ has the lowest first ionisation energy.

Which of the following elements will have the lowest first ionisation energy?

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