give reasons 1) size of cation is always smaller than parent atom 2) ionization enthalpy of nitrogen is greater than the oxygen 3) electron gain enthalpy of chlorine is negative 4) beryllium shows anomalous behaviour

Dear Student

Solution to your query (1) one has been provided below.


1) Formation of a cation takes place by removing an electron from the valence shell, but the no. of protons remain the same in the atom. Thus, effective nuclear charge per electron increase in the cation and thus it attracts the valence electron more in a cation resulting in decrease in the radius.
 
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