Match the following species with their corresponding ground state electronic configuration. Atom/Ion Electronic Configuration (i) Cu (a) 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 10 (ii) Cu 2 + (b) 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 10 4 s 2 (iii) Zn 2 + (c) 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 10 4 s 1 (iv) Cr 3 + (d) 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 9 (e) 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 3

(a) Cu has atomic number 29 , therefore its electronic configuration is 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 10 4 s 1 . Atom/Ion Electronic configuration (i) Cu (c) 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 10 4 s 1 (b) Cu + 2 has two electrons less than the ground state copper atom, therefore it electronic configuration is 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 9 Atom/Ion Electronic configuration (i) Cu + 2 (d) 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 9 (c) Zn + 2 has two electrons less than the ground state zinc ( 30 ) atom; therefore its electronic configurations is 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 10 . Atom/Ion Electronic configuration (i) Zn + 2 (a) 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 10 (d) Cr + 3 has three electrons less than the ground state chromium ( 24 ) atom; therefore, its electronic configuration is 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 3 Atom/Ion Electronic configuration (i) Cr + 3 (e) 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 3 Atom/Ion Electronic Configuration (i) Cu (c) 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 10 4 s 1 (ii) Cu 2 + (d) 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 9 (iii) Zn 2 + (a) 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 10 (iv) Cr 3 + (e) 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 3

Match the quantum numbers with the information provided by these. Quantum Number Information Provided (a) Principal quantum number (p) orientation of the orbital (b) Azimuthal quantum number (q) energy and size of orbital (c) Magnetic quantum number (r) spin of electron (d) Spin quantum number (s) shape of the orbital

(a)The principal quantum number 'n' determines the energy and size of the orbital. All the orbitals with given value n; constitute a single shell of an atom. Quantum Number Information Provided (a) Principal quantum number (q) energy and size of the orbital (b) Azimuthal quantum number, also known as orbital angular momentum or subsidiary quantum number, it determines the three-dimensional shape of the orbital. Quantum Number Information Provided (b) Azimuthal quantum number (s) shape of the orbital (c) Magnetic quantum number determines the spatial orientation of an orbital with respect to the standard set of co-ordinate axis. Quantum Number Information Provided (c) Magnetic quantum number (p) orientation of the orbital (d) Spin quantum number determines the spin of the electron, the values for which can be + 1 / 2 and - 1 / 2 Quantum Number Information Provided (d) Spin quantum number (r) Spin of electron Quantum Number Information Provided (a) Principal quantum number (q) energy and size of orbital (b) Azimuthal quantum number (s) Shape of the orbital (c) Magnetic quantum number (p) Orientation of the orbital (d) Spin quantum number (r) spin of electron

Match the following rules with their statements : Rules Statements (i) Hund’s Rule (a) No two electrons in an atom can have the same set of four quantum numbers. (ii) Aufbau Principle (b) Half-filled and completely filled orbitals have extra stability. (iii) Pauli Exclusion Principle (c) Pairing of electrons in the orbitals belonging to the same subshell does not take place until each orbital is singly occupied (iv) Heisenberg’s Uncertainty Principle (d) It is impossible to determine the exact position and exact momentum of a subatomic particle simultaneously (e) In the ground state of atoms, orbitals are filled in the order of their increasing energies

(i) The rule states that for a given electron configuration, the lowest energy term is the one with the greatest value of spin multiplicity. This implies that if two or more orbitals of equal energy are available, electrons will occupy them singly before filling them in pairs. (ii) The Aufbau principle states that electrons fill lower-energy atomic orbitals before filling higher-energy ones. By following this rule, we can predict the electron configurations for atoms or ions. (iii) Pauli's Exclusion Principle states that no two electrons in the same atom can have identical values for all four of their quantum numbers. (iv) The Heisenberg Uncertainty Principle states that it is impossible to determine simultaneously, the exact position and exact momentum (or velocity) of an electron. Rules Statements (i) Hund’s Rule (c) Pairing of electrons in the orbitals belonging to the same subshell does not take place until each orbital is singly occupied. (ii) Aufbau Principle (e) In the ground state of atoms, orbitals are filled in the order of their increasing energies. (iii) Pauli Exclusion Principle (a) No two electrons in an atom can have the same set of four quantum numbers. (iv) Heisenberg’s Uncertainty Principle (d) It is impossible to determine the exact position and exact momentum of a subatomic particle simultaneously.

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11th CBSE

IMPORTANT

Earn 100

A hypothetical electromagnetic wave is shown in Figure. Find out the wavelength of the radiation.

Important Questions on Structure of Atom

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11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 2 - Structure of Atom>Short Answer Type>Q 37

Chlorophyll present in the green leaves of plants absorbs light at

4.620 \times 10^{14} Hz

. Calculate the wavelength of radiation in the nanometer. Which part of the electromagnetic spectrum does it belong to?

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11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 2 - Structure of Atom>Short Answer Type>Q 38

What is the difference between the terms orbit and orbital?

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11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 2 - Structure of Atom>Short Answer Type>Q 39

Table-tennis ball has a mass

10 g

and a speed of

90 m / s

. If speed can be measured within an accuracy of

4 %

, what will be the uncertainty in speed and position?

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11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 2 - Structure of Atom>Short Answer Type>Q 40

The effect of uncertainty principle is significant only for motion of microscopic particles and is negligible for the macroscopic particles. Justify the statement with the help of a suitable example.

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11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 2 - Structure of Atom>Short Answer Type>Q 41

Hydrogen atom has only one electron, so mutual repulsion between electrons is absent. However, in multielectron atoms mutual repulsion between the electrons is significant. How does this affect the energy of an electron in the orbitals of the same principal quantum number in multielectron atoms?

EASY

11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 2 - Structure of Atom>Matching Type>Q 42

Match the following species with their corresponding ground state electronic configuration.

Atom/Ion		Electronic Configuration
(i)	$Cu$	(a)	$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10}$
(ii)	${Cu}^{2 +}$	(b)	$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{2}$
(iii)	${Zn}^{2 +}$	(c)	$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{1}$
(iv)	${Cr}^{3 +}$	(d)	$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{9}$
		(e)	$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{3}$

EASY

11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 2 - Structure of Atom>Matching Type>Q 43

Match the quantum numbers with the information provided by these.

Quantum Number		Information Provided
(a)	Principal quantum number	(p)	orientation of the orbital
(b)	Azimuthal quantum number	(q)	energy and size of orbital
(c)	Magnetic quantum number	(r)	spin of electron
(d)	Spin quantum number	(s)	shape of the orbital

MEDIUM

11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 2 - Structure of Atom>Matching Type>Q 44

Match the following rules with their statements :

Rules		Statements
(i)	Hund’s Rule	(a)	No two electrons in an atom can have the same set of four quantum numbers.
(ii)	Aufbau Principle	(b)	Half-filled and completely filled orbitals have extra stability.
(iii)	Pauli Exclusion Principle	(c)	Pairing of electrons in the orbitals belonging to the same subshell does not take place until each orbital is singly occupied
(iv)	Heisenberg’s Uncertainty Principle	(d)	It is impossible to determine the exact position and exact momentum of a subatomic particle simultaneously
		(e)	In the ground state of atoms, orbitals are filled in the order of their increasing energies

A hypothetical electromagnetic wave is shown in Figure. Find out the wavelength of the radiation.

Important Questions on Structure of Atom

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