Question

10. The quantum number which is equal for all the d- electrons in an atom is



l

m

s

n

 

11. the pair of orbitals having same number of nodal planes is



2s, 2p

2p, 3p

3d, 3s

3p, 4f

​

Answer 1

Answer:

10) n

11) A plane passing through the nucleus on which the probability of finding electron is zero, is called a nodal plane. The number of nodal planes in an orbital is equal to azimuthal quantum number(l).

Only option C has value l=1. Hence, nodal plane is found in L shell and p orbital.

Answer 2

Answer:

10. The quantum number which is equal for all the d-electrons in an atom is the azimuthal quantum number (l)

• The principal quantum number (n) depends on the level of the electronic shell. Therefore, the value of n will differ for each of the d-electron.
• The magnetic quantum number (m) takes values from -l to +l. Therefore, the value of m will also differ for each d-electron.
• The spin quantum number (s) has only two values, +1/2 and -1/2. Therefore, not all d-electrons will have the same value of s.
• The azimuthal quantum number (l) has a fixed value for a given orbital. That is, for all the d orbital electrons, the value of l will remain the same, i.e., l = 2

11. The pair of orbitals having the same number of nodal planes are 2p, 3p.

• The s orbital has no nodal planes.
• The p orbital has one nodal plane.
• The d orbital has two nodal planes.
• The f orbital has three nodal planes.
• Therefore, the 2p and 3p orbitals will have the same number of nodal planes.

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