Master Atomic Structure: Quizzes and Practice for Chemistry MSc

Question 1

Which of the following does NOT influence the atomic radius of an element?

Accepted Answer

Number of neutrons

Answer

Number of electron shells

Answer

Effective nuclear charge

Answer

Number of electrons

Question 2

Which type of chemical bond results from the complete transfer of electrons?

Accepted Answer

Ionic bond

Answer

Covalent bond

Answer

Metallic bond

Answer

Hydrogen bond

Question 3

According to VSEPR theory, what is the molecular geometry of a molecule with four electron pairs around its central atom?

Accepted Answer

Tetrahedral

Answer

Linear

Answer

Trigonal planar

Answer

Square planar

Question 4

Which element pair is most likely to form an ionic bond?

Accepted Answer

Sodium and chlorine

Answer

Hydrogen and oxygen

Answer

Carbon and carbon

Answer

Nitrogen and fluorine

Question 5

Which molecule has a dipole moment?

Accepted Answer

H₂O

Answer

CO₂

Answer

CH₄

Answer

N₂

Question 6

In which energy level are the valence electrons of an element located?

Accepted Answer

Outermost energy level

Answer

First energy level

Answer

Second energy level

Answer

Lowest energy level

Question 7

Which element in the periodic table has the highest electronegativity?

Accepted Answer

Fluorine

Answer

Chlorine

Answer

Bromine

Answer

Iodine

Question 8

A polar covalent bond exists between:

Accepted Answer

C-O

Answer

H-H

Answer

N-N

Answer

F-F

Question 9

The carbon atom in methane (CH₄) has a hybridization of:

Accepted Answer

sp³

Answer

sp

Answer

sp²

Answer

sp³d

Question 10

The strongest type of chemical bond is a:

Accepted Answer

Ionic bond

Answer

Covalent bond

Answer

Hydrogen bond

Answer

Van der Waals force

Question 11

Which of the following elements is a metalloid?

Accepted Answer

Boron

Answer

Carbon

Answer

Nitrogen

Answer

Oxygen

Question 12

An orbital with the quantum numbers n=3 and l=2 has the shape of a:

Accepted Answer

d-orbital

Answer

s-orbital

Answer

p-orbital

Answer

f-orbital

Question 13

What is the technical term used to describe the arrangement and distribution of electrons within an atom?

Accepted Answer

Electronic configuration

Answer

Crystal lattice

Answer

Molecular geometry

Answer

Atomic structure

Question 14

Which type of chemical bond results from the sharing of electron pairs between atoms?

Accepted Answer

Covalent bond

Answer

Ionic bond

Answer

Hydrogen bond

Answer

Metallic bond

Question 15

Which of the following is a consequence of the wave-particle duality of electrons?

Accepted Answer

Electrons exhibit characteristics of both particles and waves

Answer

Electrons are confined to fixed orbits around the nucleus

Answer

Electrons always exist in pairs with opposite spins

Answer

Electrons possess a definite energy and momentum

Question 16

Which ion is isoelectronic with neon?

Accepted Answer

O²⁻

Answer

Ca²⁺

Answer

Cl⁻

Answer

Na⁺

Question 17

Which element exhibits the highest first ionization energy?

Accepted Answer

Helium

Answer

Lithium

Answer

Hydrogen

Question 18

What is the hybridization of the carbon atom in methane (CH₄)?

Accepted Answer

sp³

Answer

dsp³

Answer

sp

Answer

sp²

Question 19

In which region surrounding the atomic nucleus is electron density most likely to be concentrated?

Accepted Answer

Electron cloud

Answer

Electron shell

Answer

Atomic orbital

Answer

Photon cloud

Question 20

Which element among the given options exhibits the highest electronegativity?

Accepted Answer

Fluorine

Answer

Iodine

Answer

Bromine

Answer

Chlorine

Question 21

In HNO3, what is the oxidation number assigned to nitrogen?

Accepted Answer

+5

Answer

+1

Answer

-3

Answer

+3