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Do these elements also contain the same ...

Do these elements also contain the same number of valence electrons Li , Na , Mg ?

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No, all these elements contain different number of valence electrons. 3] Do they contain the same number of shells? Answer: Yes. All these elements contain the same number of shells, i.e., two shells - Kand L.
Inference: From this activity, we learn that the in a period, all elements have same number of shells but not same number of valence electrons. As we move downwards in a period, the number of valence electrons increases by one.
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ZEN PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-ACTIVITY 5.5 (ii)
  1. Do these elements also contain the same number of valence electrons Li...

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