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which element have highest melting point among d orbital ?

Dear Student, 
In 3d series, Chromium has highest melting point. 
In 4d series, Molybdenum has highest melting point. 
In 5d series, Tungsten has highest melting point. 
Overall in d-block, Tungsten has highest melting point. 
Regards. 

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The melting and boiling points of transition elements except Cd and Hg, are very high as compared to the s-block and p-block elements. The melting and boiling points first increase, reaches maximum and then steadily decrease across any transition series. The maximum occurs around middle of the series.
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