Question

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Answer 1

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$\textsf{Classification \: of\: elements\: and\: Periodicity\: in \: properties}$

★ when
n = 5,
l = 0,1,2,3

The order in which the energy of the available orbitals 4d, 5s and 5p increases is 5s < 4d < 5p.
The total number of orbitals available are 9. The maximum number of electrons that can be accommodated is 18,

and therefore 18 elements are there in the 5th period.

Answer 2

Explanation:

Classification of elements and Periodicity in properties....

n = 5,

l = 0,1,2,3

The order in which the energy of the available orbitals 4d, 5s and 5p increases is 5s < 4d < 5p.

The total number of orbitals available are 9. The maximum