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AP EAMCET202021 Sep 2020Morning ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

The second ionisation energies of ( Li , Be , B ) and ( C ) are in the order

Options

  1. AL (> ) C (> ) B (> ) Be
  2. BLi (> ) B (> ) C (> ) Be
  3. C( Be > C > B > Li )
  4. DB (> ) C (> ) Be (> ) Li

Correct answer

B. Li (> ) B (> ) C (> ) Be

Step-by-step solution

The second ionisation energy is the energy required to remove an electron from a ( I + ) cation in the gaseous state. (X⁺(g) X²⁺(g)+e⁻ ) Just like the first ionisation energy, the second ionisation energy is affected by size, effective nuclear charge, and electron configuration. Li has highest ( IE ₂ ) than because the second electron remove from stable noble gas configuration and (B ) has higer ( IE ₂ ) than ( C ) due to the extra stability of the (2 s^2 ) subshell in the ( B ⁺ )ion. Therefore, the order is ( Li >

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