State reasons for the following observations: (i) The enthalpies of atomisation of transition elements are quite high.(ii) There is a greater horizontal similarity in the properties of the transition elements than of the main group elements.

State reasons for the following observations: (i) The enthalpies of at

1.	State reasons for the following observations: (i) The enthalpies of atomisation of transition elements are quite high.(ii) There is a greater horizontal similarity in the properties of the transition elements than of the main group elements.
Answer» (i) This is because, transition elements have strong metallic bonds due to presence of large number of unpaired electrons. (ii) This is because in transition elements incoming electron goes into d-orbitals of inner shell whereas in main group elements, the incoming electron goes to outermost shell.

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State reasons for the following observations: (i) The enthalpies of atomisation of transition elements are quite high.(ii) There is a greater horizontal similarity in the properties of the transition elements than of the main group elements.

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