Question

In a group, a particular element has the lowest ionization potential; does it ionize most easily or least easily? Explain with example.

Answer 1

The particular with lowest ionization potential in a group will ionize most easily.
For example among elements of group 1 Value of ionization potential is:

Element	Li	Na	K	Rb	Cs
Ionization  energy KJ mol-1	520	496	419	403	375

Cesium (Cs) has lowest ionization potential value which is 375 KJmol^-1. So it will ionize most easily.
Concept Insight :
Lesser is the ionization potential value; more easily is the tendency to form a cation.