Question

which elements has least ionisation enthalphy​

Answer 1

Answer:

Cesium

because of the shielding effect that the ionization energy decreases from top to bottom within a group.

Cesium is said to have the lowest ionization energy and Fluorine is said to have the highest ionization energy (with the exception of Helium and Neon).

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Answer 2

Answer:

cesium ( cs ) has low ionization enthalpy.

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