Hund's Rule states that:

The maximum number of electrons in the shell with principal quantum n is equal to

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No two electrons in an atom can have the same set of four quantum numbers

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Pairing of electrons in the orbitals belonging to the same subshell (p, d or f) does not take place until each orbital belonging to that subshell has got one electron each i.e., it is singly occupied

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None of these

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Solution

The correct option is C
Pairing of electrons in the orbitals belonging to the same subshell (p, d or f) does not take place until each orbital belonging to that subshell has got one electron each i.e., it is singly occupied

Hund's Rule of Maximum Multiplicity:

This rule deals with the filling of electrons into the orbitals belonging to the same subshell (that is, orbitals of equal energy, called degenerate orbitals). It states: pairing of electrons in the orbitals belonging to the same subshell (p, d or f) does not take place until each orbital belonging to that subshell has got one electron each i.e., it is singly occupied.

Since there are three p, five d and seven f orbitals, therefore, the pairing of electrons will start in the p, d and f orbitals with the entry of 4th, 6th and 8th electron, respectively.

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Similar questions

Q. Match the following:

Rules	Statements
A) Hund's rule of maximum multiplicity	P) No two electrons in an atom can have the same set of quantum numbers
B) Aufbau principle	Q) Half-filled and completely filled orbitals have extra stability
C) Pauli's exclusion principle	R) Pairing of electrons in the orbitals belonging to the same subshell does not take place until each orbital is singly occupied
D) Hiesenberg's Uncertainity Principle	S) It is impossible to determine the exact position and exact momentum of a subatomic particle simultaneously
	T) In the ground state of atoms, orbitals are filled in the order of their increasing energies

Q. Match the following:

Rules	Statements
A) Hund's rule of maximum multiplicity	P) No two electrons in an atom can have the same set of quantum numbers
B) Aufbau principle	Q) Half-filled and completely filled orbitals have extra stability
C) Pauli's exclusion principle	R) Pairing of electrons in the orbitals belonging to the same subshell does not take place until each orbital is singly occupied
D) Hiesenberg's Uncertainity Principle	S) It is impossible to determine the exact position and exact momentum of a subatomic particle simultaneously
	T) In the ground state of atoms, orbitals are filled in the order of their increasing energies

Q. Every orbital in a subshell is singly occupied with one electron before any one orbital is doubly occupied, and all electrons in singly occupied orbitals have the same spin. This belongs to :

Which of the following statements related to the modern periodic table is incorrect?
(a) The p-block has 6 columns, because a maximum of 6 electrons can occupy all the orbitals in a p-shell.
(b) The d-block has 8 columns, because a maximum of 8 electrons can occupy all the orbitals in a d-subshell.
(c) Each block contains a number of columns equal to the number of electrons that can occupy that subshell.
(d) The block indicates value of azimuthal quantum number (l ) for the last subshell that received electrons in building up the electronic configuration.

Q. Which of the following options is/are correct for a shell having principal quantum number n = 5?

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