Structure of Atom NEET PYQ – Chapter-wise Previous Year Questions with Solutions

Q 1 :
Select the correct statements from the following:

A. Atoms of all elements are composed of two fundamental particles.
B. The mass of electron is $9.10939 \times 10^{- 31}$ kg.
C. All the isotopes of a given element show same chemical properties.
D. Protons and electrons are collectively known as nucleons.
E. Dalton’s atomic theory, regarded the atom as an ultimate particle of matter.

Choose the correct answer from the options given below: [2023]

A and E only
B, C and E only
A, B and C only
C, D and E only

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2

3

4

(2)

Atoms of all elements are composed of three fundamental particles: electrons, protons and neutrons.
Protons and neutrons are collectively known as nucleons.
Hence, B, C and E are correct statements.

Q 2 :
From the following pairs of ions which one is not an iso-electronic pair? [2021]

${Fe}^{2 +}, {Mn}^{2 +}$
$O^{2 -}, F^{-}$
${Na}^{+}, {Mg}^{2 +}$
${Mn}^{2 +}, {Fe}^{3 +}$

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2

3

4

(1)

Among the given pairs of ions, ${Fe}^{2 +}$ and ${Mn}^{2 +}$ is not an iso-electronic pair.

Q 3 :
The number of protons, neutrons and electrons in ${}_{71}^{175}{Lu}$ , respectively, are [2020]

71, 104 and 71
104, 71 and 71
71, 71 and 104
175, 104 and 71

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(1)

${}_{71}^{175}{Lu},$ Number of protons = Number of electrons = Atomic number = 71

Number of neutrons = Mass number – Atomic number

= 175 – 71 = 104

Q 4 :
${Be}^{2 +}$ is isoelectronic with which of the following ions? [2014]

$H^{+}$
${Li}^{+}$
${Na}^{+}$
${Mg}^{2 +}$

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2

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(2)

Species	No. of electrons
${Be}^{2 +}$	2
$H^{+}$	0
${Li}^{+}$	2
${Na}^{+}$	10
${Mg}^{2 +}$	10

Topic Question Set

Q 2 :
From the following pairs of ions which one is not an iso-electronic pair? [2021]

Q 3 :
The number of protons, neutrons and electrons in ${}_{71}^{175}{Lu}$ , respectively, are [2020]

Q 4 :
${Be}^{2 +}$ is isoelectronic with which of the following ions? [2014]

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Topic Question Set

Q 2 : From the following pairs of ions which one is not an iso-electronic pair? [2021]

Q 3 : The number of protons, neutrons and electrons in Lu71175, respectively, are [2020]

Q 4 : Be2+ is isoelectronic with which of the following ions? [2014]

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Q 2 :
From the following pairs of ions which one is not an iso-electronic pair? [2021]

Q 3 :
The number of protons, neutrons and electrons in ${}_{71}^{175}{Lu}$ , respectively, are [2020]

Q 4 :
${Be}^{2 +}$ is isoelectronic with which of the following ions? [2014]