Grade 12Inorganic Chemistry

Why melting point of cr is at peak as due to 4s1 3d5 configuration it has half filled d orbital which makes it stable than V so than how it has high melting point than V?

riddhi shah

5 Years agoGrade 12

1 Answer

Pawan Prajapati

5 Years ago

Answer ::
The outermost as well as inner shell electrons contribute to the bonding in transition metals. Across Period 4 in the periodic table, the melting points of 3d transition metal elements show a maximal peak around vanadium and chromium. Further, the melting points decrease from chromium to copper and zinc.

Melting point in transition metal increases as the number of unpaired electron increases. Cr has six unpaired electrons but due to stable electron configuration (3d5 4S1) do not want to lose electron. As the 3d orbital is half filled, therefore, the melting point of Vanadium is little higher than Cr.

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