Identify the element having the highest ioniz | vedclass

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(A) The ionization enthalpy $(I.E.)$ is the energy required to remove an electron from an isolated gaseous atom.In the periodic table,as we move down

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$Li$

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(A) The ionization enthalpy $(I.E.)$ is the energy required to remove an electron from an isolated gaseous atom.In the periodic table,as we move down a group,the atomic size increases and the valence electrons are further from the nucleus,which leads to a decrease in $I.E.$All the given elements $(Li, K, Rb, Cs)$ belong to Group $1$ (Alkali metals).Since $Li$ is at the top of the group,it has the smallest atomic size and therefore the highest $I.E.$ among the given options.

Identify the element having the highest ionization enthalpy.

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