Atomic Models and Electronic Configuration - Atomic Structure and Periodicity - Life Sciences Previous Year Questions

1

2007 · Life Sciences · Atomic Structure and Periodicity · Atomic Models and Electronic Configuration

Life Sciences (XL) 2007

The ionization energy of hydrogen atom in ground state is 13.6 eV. The ionization energy of Li²⁺ in ground state would be

A

1.51 eV

B

4.53 eV

C

40.8 eV

D

122.4 eV

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2

2007 · Life Sciences · Atomic Structure and Periodicity · Atomic Models and Electronic Configuration

Life Sciences (XL) 2007

In the nuclear reaction of ²³⁵U with a neutron, two elements, Kr and ‘Y’ are formed along with three neutrons. ²³⁵U + ¹n → ⁹¹Kr + 3 ¹n + ‘Y’ The element ‘Y’ is

A

¹⁴²Ba

B

¹⁴²Cs

C

¹⁴²Xe

D

¹⁴²I

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3

2007 · Life Sciences · Atomic Structure and Periodicity · Atomic Models and Electronic Configuration

Life Sciences (XL) 2007

Which of the following statements is true about diatomic species He₂ and He₂⁺?

A

He₂ is stable AND He₂⁺ is stable

B

He₂ is stable AND He₂⁺ is unstable

C

He₂ is unstable AND He₂⁺ is stable

D

He₂ is unstable AND He₂⁺ is unstable

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4

2009 · Life Sciences · Atomic Structure and Periodicity · Atomic Models and Electronic Configuration

Life Sciences (XL) 2009

If the ground state ionization energy of the hydrogen atom is denoted by \( \varepsilon \), then the energy required to ionize an electron from the 3d energy level of the hydrogen atom is

A

\(\frac{2\varepsilon}{3} \)

B

\(\frac{\varepsilon}{9} \)

C

\(\frac{\varepsilon}{3} \)

D

\(\frac{8\varepsilon}{9} \)

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5

2011 · Life Sciences · Atomic Structure and Periodicity · Atomic Models and Electronic Configuration

Life Sciences (XL) 2011

According to the molecular orbital theory, bond order for H₂⁺ species is

A

0.5

B

1.0

C

1.5

D

2.0

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6

2014 · Life Sciences · Atomic Structure and Periodicity · Atomic Models and Electronic Configuration

Life Sciences (XL) 2014

Potassium metal crystallizes in the body-centered cubic structure. The number of atoms per unit cell is equal to

A

one

B

two

C

three

D

four

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7

2014 · Life Sciences · Atomic Structure and Periodicity · Atomic Models and Electronic Configuration

Life Sciences (XL) 2014

A ball of mass 330 g is moving with a constant speed, and its associated de Broglie wavelength is \(1 \times 10^{-33}\) m. The speed of the ball is ________ m s\(^{-1}\). (h = 6.6 × 10\(^{-34}\) J s)

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8

2016 · Life Sciences · Atomic Structure and Periodicity · Atomic Models and Electronic Configuration

Life Sciences (XL) 2016

Given: The potential energy of two electrons separated by Bohr radius is 27.211 eV. The first Bohr radius of hydrogen is 0.5292 Å. The electron makes an orbit of radius 0.5295Å around the nucleus in hydrogen.
The calculated ionization energy (eV) of hydrogen atom is ______________.

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9

2017 · Life Sciences · Atomic Structure and Periodicity · Atomic Models and Electronic Configuration

Life Sciences (XL) 2017

Molecules that are NOT isoelectronic to NO₂^- ion are

A

CO₂ and N₃^-

B

NCO^- and H₃BCN^-

C

BO₂^- and H₃CC≡CH

D

OF₂ and O₃^-

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10

2017 · Life Sciences · Atomic Structure and Periodicity · Atomic Models and Electronic Configuration

Life Sciences (XL) 2017

Assuming independent non-interacting electrons, the first ionization energy of Helium atom is

A

13.6 eV

B

27.2 eV

C

54.4 eV

D

108.8 eV

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11

2018 · Life Sciences · Atomic Structure and Periodicity · Atomic Models and Electronic Configuration

Life Sciences (XL) 2018

For a 4s orbital of hydrogen atom, the magnetic quantum number (m) is

A

4

B

3

C

1

D

0

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12

2018 · Life Sciences · Atomic Structure and Periodicity · Atomic Models and Electronic Configuration

Life Sciences (XL) 2018

Hybridization of xenon in XeF₂ is

A

sp

B

sp²

C

sp³

D

sp³d

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13

2019 · Life Sciences · Atomic Structure and Periodicity · Atomic Models and Electronic Configuration

Life Sciences (XL) 2019

Based on molecular orbital theory, the number of paramagnetic species in the following list
N₂, N₂⁺, N₂²⁻, O₂, O₂⁺, O₂⁻ and O₂²⁻
is ____ (assume that there is no change in energy of the orbitals upon addition/removal of electrons in a molecule)

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14

2020 · Life Sciences · Atomic Structure and Periodicity · Atomic Models and Electronic Configuration

Life Sciences (XL) 2020

The azimuthal quantum number (l) of an electron in the d_z² orbital of a copper atom (atomic number: 29) is __________.

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15

2021 · Life Sciences · Atomic Structure and Periodicity · Atomic Models and Electronic Configuration

Life Sciences (XL) 2021

The ground state energy of an electron in a hydrogen atom is –13.60 eV.
The energy of the electron in the third excited state is ______ eV
(rounded off to two decimal places).

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16

2022 · Life Sciences · Atomic Structure and Periodicity · Atomic Models and Electronic Configuration

Life Sciences (XL) 2022

A 16 mW monochromatic light emits \( 4 \times 10^{16} \) photons in 1 second. When this light incidents on a metal strip, photoelectrons are emitted. The wavelength of the emitted photoelectrons (in \( \text{\AA} \)) is _____ (round off to one decimal place).
Given: Work function of the metal = 2.0 eV
Charge of an electron = \( 1.6 \times 10^{-19} \) C
Mass of an electron = \( 9.1 \times 10^{-31} \) kg
Planck's constant = \( 6.626 \times 10^{-34} \) J s

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17

2023 · Life Sciences · Atomic Structure and Periodicity · Atomic Models and Electronic Configuration

Life Sciences (XL) 2023

The number of radial node(s) for the valence orbital of U(III) ion is _____ (in integer).
(Given: Atomic number of U is 92)

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18

2024 · Life Sciences · Atomic Structure and Periodicity · Atomic Models and Electronic Configuration

Life Sciences (XL) 2024

The maximum number of electrons that can be accommodated in the shell with n = 2 is ______ (in integer).

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19

2025 · Life Sciences · Atomic Structure and Periodicity · Atomic Models and Electronic Configuration

Life Sciences (XL) 2025

Energy of the transition from \(n_h = 4\) to \(n_l = 2\) for hydrogen atom is \(E \times 10^3\) cm⁻¹.
Given: Rydberg constant for hydrogen: \(1.097 \times 10^7\) m⁻¹.
Value of E is __________. (rounded off to two decimal places)

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20

2026 · Life Sciences · Atomic Structure and Periodicity · Atomic Models and Electronic Configuration

Life Sciences (XL) 2026

The CORRECT combination(s) of element and their ground state electronic configuration is/are
(Atomic Numbers: Ar-18, Sc-21, Cr-24, Mn-25 and Fe-26)

A

Sc – [Ar] 4s² 3d¹

B

Cr – [Ar] 4s² 3d⁴

C

Mn – [Ar] 4s² 3d⁵

D

Fe – [Ar] 4s² 3d⁶

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