The number of unpaired electrons in 1s2 2s2 2p3 is -

1. 2

2. 0

3. 3

4. 1

Subtopic:  Pauli's Exclusion Principle & Hund's Rule |
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Match the following species with their corresponding ground state electronic configuration.

Atom/Ion Electronic configuration
A. Cu 1. 1s22s22p63s23p63d10
B. Cu2+ 2. 1s22s22p63s23p63d104s2
C. Zn2+ 3. 1s22s22p63s23p63d104s1
D. Cr3+ 4. 1s22s22p63s23p63d9
5. 1s22s22p63s23p63d3
 
A B C D
1. 4 2 5 1
2. 3 4 1 5
3. 3 2 1 4
4. 4 2 1 3
Subtopic:  Pauli's Exclusion Principle & Hund's Rule |
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An electronic configuration representing an atom in the excited state is

1. 1s2,2s22p1                     2. 1s2,2s22p23. 1s2,2s22p2,3s1             4. 1s2,2s22p5

Subtopic:  Pauli's Exclusion Principle & Hund's Rule |
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Match the ensuing rules with the corresponding statements

Rules Statements
A. Hund’s Rule 1. No two electrons in an atom can have the same set of four quantum numbers.
B. Aufbau Principle 2. Half-filled and completely filled orbitals have extra stability.
C. Pauli's Exclusion Principle 3. Pairing of electrons in the orbitals belonging to the same subshell does not take place until each orbital is singly occupied.
D. Heisenberg’s Uncertainty Principle 4. It is impossible to determine the exact position and exact momentum of a subatomic particle simultaneously.
5. In the ground state of atoms, orbitals are filled in the order of their increasing energies.
 
A B C D
1. 3 5 1 2
2. 1 2 3 4
3. 3 5 1 4
4. 4 5 3 2
Subtopic:  Pauli's Exclusion Principle & Hund's Rule |
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If the electronic structure of oxygen atom is written as 1s2, 2s2 it would violate

1.  Hund's rule

2.  Paulis exclusion principle

3.  Both Hund's and Pauli's principles

4.  None of these

Subtopic:  Pauli's Exclusion Principle & Hund's Rule |
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The orbital diagram in which both the Pauli's exclusion principle and Hund's rule are violated is

1.  

2.  

3.  

4.  

Subtopic:  Pauli's Exclusion Principle & Hund's Rule |
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Among the given options, the element having the highest number of unpaired electrons in the ground state is

1. P

2. Fe

3. Kr

4. Cr

Subtopic:  Pauli's Exclusion Principle & Hund's Rule |
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