Question

Na, Mg, Al and P belong to 3rd period but are placed in first, second, thirteenth and fifteenth group. Number of shells occupied in Mg is three. What is the number of occupied shells in Na, Al and P. Give reason for your answer.

Answer 1

Na: 2,8,1
Al: 2,8,3
P: 2,8,5
All of them have 3 shells ( you can see that as per the electronic configuraton). so, they're placed in the same period-3. But are placed in different groups as they have different valence electrons

Answer 2

Answer:

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