Read the following statements and mark the incorrect statement.

No two electrons in an atom can have all the four quantum numbers same.

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All the orbitals in a subshell are first occupied singly with parallel spins.

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The outer electronic configuration of chromium atom is

3 d^{4} 4 s^{2}

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Lyman series of hydrogen spectrum lies in ultraviolet region.

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Solution

The correct option is C The outer electronic configuration of chromium atom is $3 d^{4} 4 s^{2}$
A. No two electrons in an atom can have all the four quantum numbers same- Pauli's exclusion principle.
B. All the orbitals in a subshell are first occupied singly with parallel spins- Hund's rule of maximum multiplicity.
C. The outer electronic configuration of chromium atom is $3 d^{5} 4 s^{1}$ due to the extra stability of half-filled configuration.
D. Lyman series of hydrogen spectrum is from higher energy orbit to first orbit and it lies in ultraviolet region.

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Similar questions

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. Identify the correct statements among the following:
(A) All orbitals in a shell are degenerate.
(B) Electron configuration of chromium violates Aufbau principle.
(C) Maximum number of unpaired electrons in 'f' subshell is 7.
(D) Maximum number of unpaired electrons in a subshell is 4

l

+ 1.

State True or False.

The outer electronic configuration of the ground state chromium atom is

3 d^{4} 4 s^{2}

Q. The statement "No two electrons in an atom can have all the four quantum numbers identical" is known as the__________.

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