# Chem q40

• Q40 ans 2

• @siddhartha-ghosh

Subsidiary quantum number of 4 indicates g orbital with 9 degenerate sub- orbitals. The orbital can take up a maximum of 18 electrons.
The spin multiplicity value, is given by the formula 2S + 1

Where, S is the sum of spins of the electrons. Spin of an electron is either +1/2 or -1/2 depending on the if the electron spins in the clockwise or anticlockwise direction.

If there is one electron in the g orbital, S = +1/2
For a pair of electrons in a g sub-orbital, the spin quantum number cancels out.

So, unpaired electrons effectively contribute to spin multiplicity.

The maximum value will be given by 9 unpaired electrons with positive spin.

S = 9 × ½ = 4.5
Multiplicity = 2S + 1 = 2 × 4.5 + 1 = 10
The minimum value will be given when no unpaired electron is present
S = 0
Multiplicity = 2 × 0+ 1 = 1
So, maximum and minimum values are 10. 1 (option b)

Multiplicity indicates the various possible quantum states of a system with the principal spin quantum number S and is given by the formula 2S + 1.

S is the sum of the spin of electrons.
For example, O is the electronic configuration 1s2 2s2 2p4
For p orbital, there are 4 electrons with spins, +1/2, +1/2, +1/2 and -1/2 and
S = ½ + ½ + ½ -1/2 = 1

• @yash-kapoor thanks