NCERT Class XI Chemistry Classification of Elements and Periodicity in Properties Solutions

Question : 4

Total: 40

On the basis of quantum numbers, justify that the sixth period of the periodic table should have 32 elements.

Solution:

In the sixth period, the orbitals to be filled are 6s, 4f, 5d and 6p. The complete filling of these orbitals require 2 + 14 + 10 + 6 = 32 electrons, hence, the sixth period of the periodic table should have 32 elements.

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