A) \[{{K}^{+}}\]
B) \[C{{l}^{-}}\]
C) Ar
D) \[C{{s}^{+}}\]
Correct Answer: A
Solution :
lonisation energy It may be defined as the energy required to remove an electron from the outermost orbit of an isolated gaseous atom in its ground state. It is expressed in electron volt (eV). lonisation energy increases with decrease in size of atoms or ions. \[\xrightarrow{C{{s}^{+}}<C{{l}^{-}}<Ar<{{K}^{+}}}\] increase in ionisation energy \[{{K}^{+}}\] has the smallest size. It has highest ionisation energy.
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