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AP EAMCET20224 Jul 2022Evening ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

In second period of the long form of the periodic table, an element X has second lowest first ionization enthalpy and element Y has second highest first ionization enthalpy values. What are X and Y ?

Options

  1. AB , F
  2. BBe , Ne
  3. CBe , O
  4. DC , O

Correct answer

A. B , F

Step-by-step solution

The order of ionization enthalpy of elements of 2nd period in long form of periodic table is Li < B < Be < C < O < N < F < Ne . Generally, on going left to right in a period, ionization energy increases, but there are some exceptions to this. For example, Be has more ionization energy than B, due to fulfilled s-orbital. And N has more ionization energy than O due to half filled p-subshell. So,In second period of the long form of the periodic table, the element B has second lowest first i

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