How would you justify the presence of 18 elements in the 5th period of

1.	How would you justify the presence of 18 elements in the 5th period of the Preodic Table ?
Answer» SOLUTION :The `5^th` period of the periodic table bagins with the element in which 5s ORBITAL STARTS filling. It must endwith the compietion of 5p orbitals. The order in which the energy of the available orbitals increasses is `5s < 4D < 5p`.

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