Assertion (A): Transition metals have high enthalpy of atomisation. Reason (R): Greater number of unpaired electrons in transition metals results in weak metallic bonding.

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(A) is true, but (R) is false. Explanation: The assertion (A) is true: Transition metals exhibit a high enthalpy of atomization. This is owing to the strong metallic bonds found in these metals. The reasoning (R) is false: The existence of unpaired electrons in transition metals causes stronger, rather than weaker, metallic bonding. The delocalization of d and s electrons across the metal lattice helps to form strong metallic connections.

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