Check sibling questions

On the basis of the figure given below, answer the following questions: 

Question 11 Choice 2.jpg

(A) Why does Manganese has lower melting point than Chromium? 

(B) Why do transition metals of 3d series have lower melting points as compared to 4d series? 

(C) In the third transition series, identify and name the metal with the highest melting point. 

Answer

(A)

  • When a substance melts, it releases energy as it’s interatomic bonds break
  • The stronger the bond, the higher the melting point of the substance.
  • Manganese has a half filled d-orbital configuration with all the electrons spinning in the same direction. This makes it stable and less likely to form bonds with other atoms. 
  • It has low interatomic forces of attraction , which are easier to break .
  • Hence, it has a lower melting point than Chromium.

Mn ELECTRON CONFIGURATION - Teachoo.jpg

(B) 

  • Transition metals of 4d and 5d series have higher metallic character due to larger size of the atoms as compared to elements of 3d series.
  • They make more and stronger metallic bonds , which require more energy to break .
  • Hence, elements from the 4d and 5d series have higher melting points than those of 3d series.
    ELECTRON CONFIGURATION OF TRANSITION METALS - Teachoo.jpg

(C) As seen from the given diagram, Tungsten has the highest melting point.

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.