• # question_answer 87)   Describe the general trends in the following properties of the groups 13 and 14. (i) Atomic size (ii) Ionisation enthalpy (iii) Metallic character (iv) Oxidation states (v) Nature of halides

 Property Group 13 Group 14 1. Atomic size With the exception of gallium, the atomic size in-creases from boron to thallium. $\underset{85pm}{\mathop{B}}\,\,\,\,\underset{143}{\mathop{Al}}\,\,\,\,\underset{135}{\mathop{Ga}}\,\,\,\,\underset{167}{\mathop{\ln }}\,\,\,\,\underset{170}{\mathop{Tl}}\,$ Atomic size increases gradually from carbon to lead. $\underset{77}{\mathop{C}}\,\,\,\,\,\underset{118}{\mathop{Si}}\,\,\,\,\underset{122}{\mathop{Ge}}\,\,\,\,\underset{140}{\mathop{Sn}}\,\,\,\,\underset{146pm}{\mathop{Pb}}\,$ 2. Ionisation enthalpy A regular decreasing trend is not observed in first ionisation enthalpy. \[\begin{array}{*{35}{l}}    In