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Question

What is the general molecular formula of the product obtained when lanthanoids are heated with sulphur?


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Solution

General oxidation state of lanthanoid

  • The general electron configuration of lanthanoid is n-2f1-14n-1d0-1ns2.
  • It is attained by removing the outermost two electrons of s orbital and 1 electron from forbital.
  • It is due to the high energy difference in 4fand 6s, it is difficult to remove more electrons from 4f sub-shell.
  • So, the most stable oxidation state of the elements of the lanthanoids series is +3.

Chemical reaction of lanthanoid with sulfur

  • The reaction is as follows:-

2Ln+3SLn2S3

  • So, the molecular formula of the product obtained when lanthanoids are heated with sulfur is Ln2S3.

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