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Question
 In first transition series, the melting point of Mn is low because
Options:
A .  Due to d10 configuration, metallic bonds are strong
B .  Due to d7 configuration, metallic bonds are weak
C .  Due to d5 configuration, metallic bonds are weak
D .  None of these
Answer: Option C
:
C
Due to d5configuration, metallic bonds are weak.d5 orbital is half filled as a result 3delectrons are more tightly held by the nucleus and this reduces the de-localization of electrons resulting in weaker metallic bonding.

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