Atomic Structure Practice Questions
HSC/SSC (Bangladesh) · HSC Chemistry · 124 free MCQs with instant results and detailed explanations.
124
Total
30
Easy
63
Medium
31
Hard
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Sample Questions from Atomic Structure
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
Which of the following particles has the greatest mass?
A.
Electron
B.
Proton
C.
Neutron
D.
Photon
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Correct Answer: C
Neutrons and protons have approximately the same mass, which is significantly greater than the mass of an electron or photon. However, neutrons are slightly heavier than protons.
Q2
Easy
In which part of the atom are protons located?
A.
Electron cloud
B.
Nucleus
C.
Orbitals
D.
Valence shell
Show Answer & Explanation
Correct Answer: B
Protons are located in the nucleus of the atom, where they contribute to the atomic mass and positive charge of the nucleus.
Q3
Easy
What is the charge of a proton?
A.
Positive
B.
Negative
C.
Neutral
D.
Varies
Show Answer & Explanation
Correct Answer: A
A proton carries a positive charge, which is fundamental to its role in atomic structure as it contributes to the atomic number and overall charge of the atom.
Q4
Medium
Which of the following correctly describes the Heisenberg Uncertainty Principle?
A.
The position and momentum of a particle can be known simultaneously with accuracy.
B.
The position of a particle can be known with complete certainty.
C.
It is impossible to measure both the position and momentum of a particle accurately at the same time.
D.
All particles have a definite position and momentum at all times.
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Correct Answer: C
The Heisenberg Uncertainty Principle states that it is impossible to measure both the position and momentum of a particle with absolute precision at the same time, highlighting a fundamental limit in quantum mechanics.
Q5
Medium
Which of the following isotopes of hydrogen has a neutron in its nucleus?
A.
Protium
B.
Deuterium
C.
Tritium
D.
Hydrogen-1
Show Answer & Explanation
Correct Answer: B
Deuterium is the isotope of hydrogen that contains one neutron in its nucleus, distinguishing it from protium (no neutrons) and tritium (two neutrons).
Q6
Medium
What is the principal quantum number of the outermost electron in the element with atomic number 11?
A.
1
B.
2
C.
3
D.
4
Show Answer & Explanation
Correct Answer: C
The element with atomic number 11 is sodium (Na), which has its outermost electron in the third energy level, thus the principal quantum number is 3.
Q7
Medium
Which of the following describes the electron configuration of an atom in its ground state?
A.
Electrons occupy the highest energy levels first.
B.
Electrons fill subshells in order of increasing energy.
C.
Electrons are distributed randomly among orbitals.
D.
All electrons have the same energy level.
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Correct Answer: B
In its ground state, electrons occupy subshells according to the Aufbau principle, filling them in order of increasing energy levels, ensuring the most stable configuration.
Q8
Hard
In a hydrogen atom, which quantum number determines the shape of the orbital?
A.
Principal quantum number (n)
B.
Azimuthal quantum number (l)
C.
Magnetic quantum number (m_l)
D.
Spin quantum number (m_s)
Show Answer & Explanation
Correct Answer: B
The azimuthal quantum number (l) determines the shape of the orbital, with different values corresponding to different shapes (s, p, d, f).
Q9
Hard
Calculate the energy of the photon emitted when an electron in a hydrogen atom transitions from n=5 to n=2. Use the Rydberg formula.
A.
4.86 eV
B.
3.40 eV
C.
6.56 eV
D.
1.51 eV
Show Answer & Explanation
Correct Answer: A
The energy difference can be calculated using the Rydberg formula: ΔE = 13.6 eV * (1/n1^2 - 1/n2^2). For n=5 to n=2, ΔE = 13.6 * (1/2^2 - 1/5^2) = 4.86 eV.
Q10
Hard
Which of the following statements correctly describes the properties of isotopes?
A.
Isotopes of an element have the same number of protons but different numbers of neutrons.
B.
Isotopes have the same atomic mass but different atomic numbers.
C.
Isotopes can exist in different energy states with varying chemical properties.
D.
All isotopes of an element have the same physical and chemical properties.
Show Answer & Explanation
Correct Answer: A
Isotopes are variants of a particular chemical element which have the same number of protons but different numbers of neutrons. This results in different atomic masses but does not affect their chemical properties significantly.
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Atomic Structure — HSC/SSC (Bangladesh) HSC Chemistry Practice Questions Online
This page contains 124 practice MCQs for the chapter Atomic Structure in HSC/SSC (Bangladesh) HSC Chemistry. The questions are organized by difficulty — 30 easy, 63 medium, 31 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.