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do they contain the same number of s...

do they contain the same number of shells ?

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Yes All these elements contain the same number of shells I.e., two shells - K and L
In ference from theis acitvity , we learn that the in a period all element have same number of shells but not same number of valence electrons .As we more downwards in a period the number of valence electrons increases by one
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  1. do they contain the same number of shells ?

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