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Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar ?

Options

  1. ABa < Ca < Se < S < Ar
  2. BCa < Ba < S < Se < Ar
  3. CCa < S < Ba < Se < Ar
  4. DS < Se < Ca < Ba < Ar

Correct answer

A. Ba < Ca < Se < S < Ar

Step-by-step solution

Ba < Ca < Se < S < Ar Ba, Ca belong to gr IIA ( alkaline earth metals) Se and S belong to gr Vl A (Chalcogens) and as we go down the group ionaization enthalpy decreases with increasing atomic size. So, Ba < Ca and Se < S Ar has stable completely filled electronic configuration and, therefore,has higest ionization enthalpy.Hence,the correct order is Ba < Ca < Se < S < Ar in kJmol − 1 503 590 941 999 1520

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