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  3. Chemistry
  4. Which of the following atoms has the highest first ionization energy ?

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Q. Which of the following atoms has the highest first ionization energy ?

JEE MainJEE Main 2016Classification of Elements and Periodicity in Properties

Solution:

Element Ionisation energy (kJ/mol)
Na 496
K 419
Rb 403
Sc 631

Scandium has the highest first Ionisation energy.