Question

how does the electroinc confirmation of am element explaines it's chemical relativity

Answer 1

electronic configuration of elements explain it's chemical reactivity
the orbital in which last electron enters s
determine its reactivity
eg; in sodium, last electron enters into s orbital and shows properties of s block

Answer 2

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Electronic configuration of an element gives the information of valence electrons and number of shell present in the element. We get the information of group number after knowing valence electrons.

The number of shells present in an element is equal to the period number. Thus, by knowing electronic configuration we know the group number and period number of an element, and the position of an element in the periodic table.