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  4. An element with configuration 1 s2, 2 s2 2 p6, 3 s2 3 p5 will form a compound of highest ionic character with the element having configuration

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Q. An element with configuration $1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{5}$ will form a compound of highest ionic character with the element having configuration

Delhi UMET/DPMTDelhi UMET/DPMT 2008Classification of Elements and Periodicity in Properties

Solution:

The electronic configuration of chlorine is $1 s^2 2,2 s^{2} 2 p^{6}, 3 s^{2}, 3 p^{5}$ It is a halogen. It will formal a compound of highest ionic character with alkali metals of ${ }^{\circ}$ size.
In all of the given electronic configurations, [Ar] $4 s^{1}$
(i.e., potassium) is the configuration of an alkali metal of comparable size.