11th Class Chemistry Classification of Elements and Periodicity in Properties

  • question_answer 88)   Explain from general trend by using the following figure:

    Answer:

      The ionisation enthalpy in general in a period increases. However, in the given figure deviations are observed between Be and B and N and O. Be and N both possess stable configurations. Be has fully filled orbital while N has half filled 2p-orbitals. On account of this Be and N both have abnormal high values.

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