Q. An element with configuration will form a compound of highest ionic character with the element having configuration

 2175  213 Delhi UMET/DPMTDelhi UMET/DPMT 2008Classification of Elements and Periodicity in Properties Report Error

Solution:

The electronic configuration of chlorine is It is a halogen. It will formal a compound of highest ionic character with alkali metals of size.
In all of the given electronic configurations, [Ar]
(i.e., potassium) is the configuration of an alkali metal of comparable size.