(solved)Question 3.4 of NCERT Class XI Chemistry Chapter 3 | On the basis of quantum numbers, justify that the sixth period of the periodic table should have 32 elements.

Parveen, Jun 04, 2021

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

The orbitals start filling from $\displaystyle 6s^1$ and continue till $\displaystyle 6p^6$ .

the aufbau order is $\displaystyle 6s \lt 4f \lt 5d \lt 6p$

total orbitals 6s(1) + 4f(7) + 5d(5) + 6p(3) = 16.

by Pauli Exclusion Principle each orbital can have a maximum of 2 electrons.

$\displaystyle \therefore$ total electrons = 16 x 2 = 32.

which justifies that period 6 can have 32 elements.

Please watch this youtube video for a quick explanation of the solution:

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