Match the following (i) Photon (a) Value is 4 for N shell (ii) Electron (b) Probability density (iii) ψ 2 (c) Always positive value (iv) Principal quantum number n (d) Exhibits both momentum and wavelength

According to the de-Broglie wavelength of a particle or a photon, λ = h mv , molecules with a very small mass, exhibit both wave and particle nature, hence electron which has very less mass exhibits both momentum and wavelength. ψ 2 is the probability of finding an electron in a particular location in an atom, and always has a positive value. The probability density is a measure of the likelihood that a particle will be found at a particular location in space. In this case, where you would likely find an electron in the electron cloud. Principal quantum number ' n ' denotes the energy level (or) shell number, if n = 4 , the electron belongs to N shell. The value of ' n ' is always positive. (i) Photon (d) Exhibits both momentum and wavelength (ii) Electron (d) Exhibits both momentum and wavelength (iii) ψ 2 (b) (c) Probability density Always positive value (iv) Principal quantum number n (a) (c) Value is 4 for N shell Always positive value

Match species given in Column I with the electronic configuration given in Column II. Column I Column II (i) Cr (a) [ Ar ] 3 d 8 4 s 0 (ii) Fe 2 + (b) [ Ar ] 3 d 10 4 s 1 (iii) Ni 2 + (c) [ Ar ] 3 d 6 4 s 0 (iv) Cu (d) [ Ar ] 3 d 5 4 s 1 (e) [ Ar ] 3 d 6 4 s 2

(i) Cr has atomic number 24 , therefore its electronic configuration is Ar 3 d 5 4 s 1 . Atom/Ion Electronic configuration (i) Cr (d) Ar 3 d 5 4 s 1 (ii) Fe + 2 has two electrons less than the ground state Iron atom, therefore its electronic configuration is Ar 3 d 6 4 s 0 Atom/Ion Electronic configuration (ii) Fe + 2 (c) Ar 3 d 6 4 s 0 (iii) Ni + 2 has two electrons less than the ground state Nickel ( 28 ) atom; therefore its electronic configurations is Ar 3 d 8 4 s 0 . Atom/Ion Electronic configuration (iii) Ni + 2 (a) Ar 3 d 8 4 s 0 (iv) Cu ( 29 ) atom; therefore, its electronic configuration is Ar 3 d 10 4 s 1 Atom/Ion Electronic configuration (iv) Cu (b) Ar 3 d 10 4 s 1 Column I Column II (i) Cr (d) [ Ar ] 3 d 5 4 s 1 (ii) Fe 2 + (c) [ Ar ] 3 d 6 4 s 0 (iii) Ni 2 + (a) [ Ar ] 3 d 8 4 s 0 (iv) Cu (b) [ Ar ] 3 d 10 4 s 1

MEDIUM

11th CBSE

IMPORTANT

Earn 100

Match the following:

(i) X-rays (a) $v = 10^{0} - 10^{4} Hz$

(ii) UV (b) $v = 10^{10} Hz$

(iii) Long radio waves (c) $v = 10^{16} Hz$

(iv) Microwave (d) $v = 10^{18} Hz$

Important Questions on Structure of Atom

EASY

11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 2 - Structure of Atom>Matching Type>Q 46

Match the following

(i)	Photon	(a)	Value is $4$ for $N$ shell
(ii)	Electron	(b)	Probability density
(iii)	$ψ^{2}$	(c)	Always positive value
(iv)	Principal quantum number $n$	(d)	Exhibits both momentum and wavelength

EASY

11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 2 - Structure of Atom>Matching Type>Q 47

Match species given in Column I with the electronic configuration given in Column II.

Column I		Column II
(i)	$Cr$	(a)	$[Ar] 3 d^{8} 4 s^{0}$
(ii)	${Fe}^{2 +}$	(b)	$[Ar] 3 d^{10} 4 s^{1}$
(iii)	${Ni}^{2 +}$	(c)	$[Ar] 3 d^{6} 4 s^{0}$
(iv)	$Cu$	(d)	$[Ar] 3 d^{5} 4 s^{1}$
		(e)	$[Ar] 3 d^{6} 4 s^{2}$

MEDIUM

11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 2 - Structure of Atom>Long Answer Type>Q 51

What is photoelectric effect? State the result of photoelectric effect experiment that could not be explained on the basis of laws of classical physics. Explain this effect on the basis of quantum theory of electromagnetic radiations.

HARD

11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 2 - Structure of Atom>Long Answer Type>Q 52

Threshold frequency,

ν_{0}

is the minimum frequency which a photon must possess to eject an electron from a metal. It is different for different metals. When a photon of frequency

1.0 \times 10^{15} s^{- 1}

was allowed to hit a metal surface, an electron having

1.988 \times 10^{- 19} J

of kinetic energy was emitted. Calculate the threshold frequency of this metal. Show that an electron will not be emitted if a photon with a wavelength equal to

600 nm

hits the metal surface.

HARD

11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 2 - Structure of Atom>Long Answer Type>Q 53

When an electric discharge is passed through hydrogen gas, the hydrogen molecules dissociate to produce excited hydrogen atoms. These excited atoms emit electromagnetic radiation of discrete frequencies which can be given by the general formula.

$\bar{ν} = 109677 (\frac{1}{n_{i}^{2}} - \frac{1}{n_{f}^{2}})$

What points of Bohr’s model of an atom can be used to arrive at this formula? Based on these points derive the above formula giving description of each step and each term.

MEDIUM

11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 2 - Structure of Atom>Long Answer Type>Q 54

Calculate the energy and frequency of the radiation emitted when an electron jumps from

n = 3

n = 2

in a hydrogen atom.

MEDIUM

11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 2 - Structure of Atom>Long Answer Type>Q 55

Why was a change in the Bohr Model of atom required? Due to which important development (s), concept of movement of an electron in an orbit was replaced by, the concept of probability of finding electron in an orbital? What is the name given to the changed model of atom?

(i)	X-rays	(a)	$v = 10^{0} - 10^{4} Hz$
(ii)	UV	(b)	$v = 10^{10} Hz$
(iii)	Long radio waves	(c)	$v = 10^{16} Hz$
(iv)	Microwave	(d)	$v = 10^{18} Hz$

Match the following: (i) X-rays (a) v=100-104Hz (ii) UV (b) v=1010Hz (iii) Long radio waves (c) v=1016Hz (iv) Microwave (d) v=1018Hz

Important Questions on Structure of Atom

Learn and Prepare for any exam you want !

Match the following:

(i) X-rays (a) $v = 10^{0} - 10^{4} Hz$

(ii) UV (b) $v = 10^{10} Hz$

(iii) Long radio waves (c) $v = 10^{16} Hz$

(iv) Microwave (d) $v = 10^{18} Hz$