Physics, asked by MahithaKamana, 2 months ago

Frame two questions to know the group and period number of a element?​

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Answered by jeeyandevadasan
0

Answer:

The number of valence electrons in the atom determines the group number of that atom i.e. if an element has 4 valence electrons then it must belong to group IV A. Since sodium has 3 shells, it belongs to period 3. Also, we notice that this element has 1 electron in its outermost orbit therefore it belongs to group I A

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