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ICSE Class 10 Chemistry 2017 Paper

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SECTION - II
Arrange the following as per the instruction given in the brackets :
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Question : 39 of 86
Marks: +1, -0
He,Ar,Ne\mathrm{He}, \mathrm{Ar}, \mathrm{Ne} (Increasing order of the number of electron shells)
Solution:  
  He<Ne<Ar.\; \mathrm{He} < \mathrm{Ne} < \mathrm{Ar} .
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