Check sibling questions

Account for the following: 

(C) Zinc is a comparatively a soft metal, iron and chromium are typically hard

Answer

Metallic bonds are formed when charged ions share electrons and form a closely packed structure.

Weak metallic bonds result in softer metals like zinc, while stronger metallic bonds result in harder metals like chromium.

Cr (3d54s1) has five unpaired electrons in its d-orbitals .

  • This allows it to use these electrons in metallic bonding, thus making stronger bonds.

ELECTRON CONFIGURATION OF CHROMIUM  - Teachoo.jpg

 

Zn (3d104s2) has no unpaired electrons in its d-orbitals. 

  • Since the electrons are already paired, they are unable to participate in bonding.
  • Hence, Zinc makes weaker bonds.

ELECTRON CONFIGURATION OF ZINC  - Teachoo.jpg

As a result of these weak metallic bonds in Zn and strong metallic bonds in Cr , Zn is soft whereas Cr is hard .

 

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Davneet Singh

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.