Which of thefollowingatom has the highestfirstionizationenergy ?

1.	Which of thefollowingatom has the highestfirstionizationenergy ?
Answer» Rb Na K SC Solution :Rb. Na and K are alkalimetals . Afterlosingoenelectron , theyachievestableelectronicconfiguration(E.C)of the nearestinert gasandhencetheirfirst ionizationenergiesare LOW. Incontrast E.C.Of Sc is [Ar] `3d^(1)4s^(2)` .Onlosingoneelectronfrom 4s- orbital it doesnot attainthestableE.C. ofthe nearestinert gas.Therefore , itsionizationenergy is muchhigher thanthoseof Rb,Na and K. Thusoption( d) iscorrect.

Discussion