The number of unpaired electrons in 1s2 2s2 2p3 is -
1. 2
2. 0
3. 3
4. 1
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyMatch the following species with their corresponding ground state electronic configuration.
Atom/Ion | Electronic configuration |
A. Cu | 1. |
B. Cu2+ | 2. |
C. Zn2+ | 3. |
D. Cr3+ | 4. |
5. |
A | B | C | D | |
1. | 4 | 2 | 5 | 1 |
2. | 3 | 4 | 1 | 5 |
3. | 3 | 2 | 1 | 4 |
4. | 4 | 2 | 1 | 3 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAn electronic configuration representing an atom in the excited state is
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyMatch 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 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIf the electronic structure of oxygen atom is written as it would violate
1. Hund's rule
2. Paulis exclusion principle
3. Both Hund's and Pauli's principles
4. None of these
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe orbital diagram in which both the Pauli's exclusion principle and Hund's rule are violated is
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAmong 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology