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NTA Abhyas JEE Main2020ChemistryClassification of Elements and Periodicity in PropertiesPractice

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

Options

  1. ASc
  2. BRb
  3. CNa
  4. DK

Correct answer

A. Sc

Step-by-step solution

Due to poor shielding of d-electrons in Sc, Z e f f of Sc becomes more so that ionisation energy of Sc is more than Na, K and Rb.

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