Question

among the following the element having highest ionisation enthalpy as well as positive gain enthalpy is a]H b]F c]He d]Na

Answer 1

Answer:

It is because of the shielding effect that the ionization energy decreases from top to bottom within a group. From this trend, 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

Explanation:

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