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JEE Main2016ChemistryClassification of Elements and Periodicity in PropertiesActual

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

Options

  1. AK
  2. BSc
  3. CRb
  4. DNa

Correct answer

B. Sc

Step-by-step solution

Ionisation energy decreases with increase in the size of atom. Na ,   K ,   Rb belongs to alkali metal and down the group ionization energy decreases as size of atom increases down the group. Among the given elements, Sc being small has the highest ionization energy ( Na =   496 ,   K = 419 ;   Sc   = 631   kJ   mol - 1 )

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