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Aufbau Principle, Pauli Exclusion Principle and Hund's Rule of Maximum Multiplicity - (Concept)
Aufbau Principle -
According to this rule, “orbitals are filled in the increasing order of their energies starting with the orbital of lowest energy”.
Energy of various orbitals are compared with (n+l) rule.
- The orbitals having lower value of (n+l), has lower energy.
- If value of (n+l) is same for two orbitals, then orbital with lower value of ‘n’ would have lower energy and filled first.
For eg: 3p and 3d.
For 3p : n=3, l=1 so n+l= 4 For 3d : n=3, l=2 so n+l=5
Thus energy of 3p is lower than that of 3d.
Pauli Exclusion Principle -
“No two electrons in an atom can have the same set of four quantum numbers" .
Hund’s Rule of Maximum Multiplicity -
"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”.
| Exam | Chapter |
| JEE MAIN | Atomic Structure |
Identify the orbital of the excited electron in the atom with an electronic configuration of [Xe] 6s2 4f14 5d9 6p1
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The 71st electron of an element X with an atomic number of 71 enters into the orbital:
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| D. |
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Which law indicates about the pairing of electrons in the same orbital?
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| D. |
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Nitrogen has the electronic configuration and not
which is determined by
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The correct decreasing order of energy for the orbitals having, following set of quantum numbers :
(A)
(B)
(C)
(D)
is :
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| B. |
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| C. |
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| D. |
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If the principal quantum number n= 6, the correct sequence of filling of electrons will be:
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| D. |
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The reason for the filling of 4s-orbital before 3d-orbitals is:
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| B. |
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| C. |
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| D. |
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Which of these orbitals has highest penetration effect?
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| D. |
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The Pauli Exclusion Principle limits the number of electrons that can occupy an orbital to:
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| B. |
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| C. |
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| D. |
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Which of the following is correct order of filling of electrons in a species having more than one electron
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| C. |
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| D. |
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Which of the following sets violate Pauli's exclusion principle :
| A. |
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| B. |
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| C. |
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| D. |
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Which of the following sets violate the Hund's rule
| A. |
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Element with electronic configuration $1 s^2, 2 s^2, 2 p^6, 3 s^2 3 p^6 3 d^{10}, 4 s^2 4 p^6 4 d^{10}, 5 s^2 5 p^3$ belongs to which group of the periodic table ____
| A. |
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| B. |
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| C. |
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| D. |
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General electronic configuration of outermost and penultimate shell of an atom is $(n-1) s^2 \quad(n-1) p^6(n-1) d^x n s^2$. If n=4 and n=5, the number of protons in the nucleus is _____
| A. |
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| B. |
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| C. |
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| D. |
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The incorrect order of energy of following orbitals is
| A. |
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| B. |
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| C. |
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| D. |
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Which of the following options does not represent ground state electronic configuration of an atom?
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| D. |
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The comprehension given below is followed by some multiple-choice questions. Each question has one correct option. Choose the correct option. In the modern periodic table, elements are arranged in order of increasing atomic numbers which is related to the electronic configuration. Depending upon the type of orbitals receiving the last electron, the elements in the periodic table have been divided into four blocks, viz, s, p, d, and f. The modern periodic table consists of 7 periods and 18 groups. Each period begins with the filling of a new energy shell. By the Aufbau principle, the seven periods (1 to 7) have 2, 8, 8, 18, 18, 32, and 32 elements respectively. The seventh period is still incomplete. To avoid the periodic table being too long, the two series of f-block elements, called lanthanoids and actinoids are placed at the bottom of the main body of the periodic table.
(c) Which of the elements whose atomic numbers are given below, cannot be accommodated in the present setup of the long form of the periodic table?
| A. |
|
| B. |
|
| C. |
|
| D. |
|
The comprehension given below is followed by some multiple-choice questions. Each question has one correct option. Choose the correct option. In the modern periodic table, elements are arranged in order of increasing atomic numbers which is related to the electronic configuration. Depending upon the type of orbitals receiving the last electron, the elements in the periodic table have been divided into four blocks, viz, s, p, d, and f. The modern periodic table consists of 7 periods and 18 groups. Each period begins with the filling of a new energy shell. By the Aufbau principle, the seven periods (1 to 7) have 2, 8, 8, 18, 18, 32, and 32 elements respectively. The seventh period is still incomplete. To avoid the periodic table being too long, the two series of f-block elements, called lanthanoids and actinoids are placed at the bottom of the main body of the periodic table.
(d) The electronic configuration of the element which is just above the element with atomic number 43 in the same group is ________.
| A. |
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| B. |
|
| C. |
|
| D. |
|
The comprehension given below is followed by some multiple-choice questions. Each question has one correct option. Choose the correct option. In the modern periodic table, elements are arranged in order of increasing atomic numbers which is related to the electronic configuration. Depending upon the type of orbitals receiving the last electron, the elements in the periodic table have been divided into four blocks, viz, s, p, d, and f. The modern periodic table consists of 7 periods and 18 groups. Each period begins with the filling of a new energy shell. By the Aufbau principle, the seven periods (1 to 7) have 2, 8, 8, 18, 18, 32, and 32 elements respectively. The seventh period is still incomplete. To avoid the periodic table being too long, the two series of f-block elements, called lanthanoids and actinoids are placed at the bottom of the main body of the periodic table.
(e) The elements with atomic numbers 35, 53, and 85 are all ________.
| A. |
|
| B. |
|
| C. |
|
| D. |
|
The comprehension given below is followed by some multiple-choice questions. Each question has one correct option. Choose the correct option. In the modern periodic table, elements are arranged in order of increasing atomic numbers which is related to the electronic configuration. Depending upon the type of orbitals receiving the last electron, the elements in the periodic table have been divided into four blocks, viz, s, p, d, and f. The modern periodic table consists of 7 periods and 18 groups. Each period begins with the filling of a new energy shell. In accordance with the Aufbau principle, the seven periods (1 to 7) have 2, 8, 8, 18, 18, 32 and 32 elements respectively. The seventh period is still incomplete. To avoid the periodic table being too long, the two series of f-block elements, called lanthanoids and actinoids are placed at the bottom of the main body of the periodic table.
(a) The element with atomic number 57 belongs to
| A. |
|
| B. |
|
| C. |
|
| D. |
|
The comprehension given below is followed by some multiple-choice questions. Each question has one correct option. Choose the correct option. In the modern periodic table, elements are arranged in order of increasing atomic numbers which is related to the electronic configuration. Depending upon the type of orbitals receiving the last electron, the elements in the periodic table have been divided into four blocks, viz, s, p, d, and f. The modern periodic table consists of 7 periods and 18 groups. Each period begins with the filling of a new energy shell. By the Aufbau principle, the seven periods (1 to 7) have 2, 8, 8, 18, 18, 32, and 32 elements respectively. The seventh period is still incomplete. To avoid the periodic table being too long, the two series of f-block elements, called lanthanoids and actinoids are placed at the bottom of the main body of the periodic table.
(b) The last element of the p-block in the 6th period is represented by the outermost electronic configuration.
| A. |
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| B. |
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| C. |
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| D. |
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If the Aufbau principle is not followed, the first three quantum numbers (n, l and m) for the valence electron of K atom may take value
| A. |
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| B. |
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| C. |
|
| D. |
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3d electron is less tightly bound to the nucleus than 4s electron, is the explanation of
| A. |
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| B. |
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| C. |
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| D. |
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The statement that is not correct for periodic classification of elements is:
| A. |
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| B. |
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| C. |
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| D. |
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In an atom, total number of electrons having quantum numbers $\mathrm{n}=4,\left|\mathrm{~m}_{\mathrm{l}}\right|=1$ and $\mathrm{m}_{\mathrm{s}}=-\frac{1}{2}$ is
| A. |
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| B. |
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| C. |
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| D. |
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In the sixth period, the orbitals that are filled are :
| A. |
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| B. |
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| C. |
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| D. |
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Which of the following electronic configuration violate Hund's rule for a $p^4$ system of an isolated gaseous species?
| A. |
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| B. |
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| C. |
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| D. |
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The electronic configuration which obeys Hund's rule for the ground state of carbon atom is:
| A. |
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| B. |
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| C. |
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| D. |
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An element R forms the highest oxide $R_2O_5$ . R belongs to ____group
| A. |
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| B. |
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| C. |
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| D. |
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The element which readily forms an ionic bond has the electronic configuration :
| A. |
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| B. |
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| C. |
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| D. |
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The correct electronic configuration for the ground state of silicon (atomic number 14) is:
| A. |
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| B. |
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| C. |
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| D. |
|
The filling of electrons into the orbitals of different atoms takes place according to the aufbau principle which is based on Pauli’s exclusion principle, the Hund’s rule of maximum multiplicity and the relative energies of the orbitals.
-
- Atomic Models
- Developments leading to the Bohr’s model of atom
- Particle Nature of electromagnetic radiation
- Photoelectric Effect
- Line Spectrum of hydrogen
- Bohr model for hydrogen atom
- Dual behavior of matter
- Heisenberg’s uncertainty principle
- Elementary ideas of quantum mechanics
- Quantum mechanical model of atom
- Quantum Numbers (Concept)
- Shape of Orbitals (Concept)
- Radial nodes and planar nodes (Concept)
- Aufbau Principle, Pauli Exclusion Principle and Hund's Rule of Maximum Multiplicity (Concept)
- Electronic configuration of any element (Concept)
- Stability of Completely filled and Half-filled Subshells (Concept)
