Answer :
The pattern about the number of orbitals of each of the elements in the same row that the number of atomic orbitals is constant among all the elements in a period.
As an illustration, the first period's top row of elements each has one orbital for each electron. There are two orbitals for the electrons in every element in the second row (second period). Each row in the table adds an orbital as you descend it.
Starting from the innermost nucleus, the numbers of protons and neutrons increase with each successive element in the cycle.
So, you notice that the elements in a row possess similar characteristics.
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