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TS EAMCET · Chemistry · Classification of Elements and Periodicity in Properties

The correct order of the first ionization enthalpies of the following elements is

  1. A Li<B<Be<N
  2. B Li<Be<B<N
  3. C N<Be<B<Li
  4. D N<B<Be<Li
Verified Solution

Answer & Solution

Correct Answer

(A) Li<B<Be<N

Step-by-step Solution

Detailed explanation

The ionisation enthalpy increases as we go from left to right in a period, while it decreases as we come down a group. So according to this, the order will be Be<B<C<N<O. But there are two exceptions, in the case of Be and N because of the highly stable 2s2…