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Write the formula of hydrogen sulphide. ...

Write the formula of hydrogen sulphide. Also name the elements presents in them.

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Due to Lanthanoids contraction the change in size of the Lanthanoids is very small as we move from `""_(57)La` to `""_(71) Lu`, therefore their chemical properties are similar. Further, their valance shell configurations remain the same because the electron are added into the inner 4f-subshell. Hence Chemistry of all lanthanoids is quite similar.
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