Class 11 Chemistry — Chapter 2: Structure of Atom
90 practice questions · 30 Easy · 30 Medium · 30 Hard
Practise Class 11 Chemistry Chapter 2, "Structure of Atom", with 90 NCERT-aligned multiple-choice questions. The set is split into 30 Easy, 30 Medium and 30 Hard questions, so you can warm up on the fundamentals and then push into the exam-level problems that separate top scorers in CBSE Board exams, JEE Main, JEE Advanced and NEET UG.
"Structure of Atom" is one of the chapters where reactions, named concepts, and balanced numerical work really pays off. Each MCQ on this chapter is timed and uses exam-grade marking (+2 correct, −1 wrong, 0 skipped), training the same accuracy-under-pressure that real papers demand. Every question carries a short explanation, so a wrong answer becomes a quick lesson rather than a dead end — the fastest way to close gaps before a test.
Use this chapter as targeted revision: attempt the Easy set first to confirm your basics on Structure of Atom, then move to Medium and Hard to test application and problem-solving. Your accuracy, streaks and XP save automatically, and the chapter feeds into your overall Class 11 Chemistry mastery score. A few sample questions are shown below; sign in free to practise all 90.
Key concepts: Structure of Atom (Class 11 Chemistry)
This chapter covers atomic models, the quantum mechanical model, quantum numbers, and the rules for filling electrons into orbitals.
- Early models
- Thomson, Rutherford and Bohr models led up to the quantum mechanical model of the atom.
- Dual nature & uncertainty
- de Broglie's matter waves and Heisenberg's uncertainty principle motivate the quantum model.
- Quantum numbers
- n (shell), l (subshell/shape), m (orientation) and s (spin) specify each electron.
- Orbitals
- Regions of high probability of finding an electron; s, p, d, f have characteristic shapes.
- Filling rules
- Aufbau principle, Pauli exclusion principle and Hund's rule govern electronic configuration.
Key formulas — Structure of Atom
💡 Exam tips for Structure of Atom
- Fill orbitals by increasing (n + l); for equal (n + l), the lower n fills first (Aufbau).
- Half-filled and fully-filled subshells have extra stability (explains Cr and Cu configurations).
Sample questions
Charge on a proton:
Positive elementary charge.
Wavenumber for H transition n₂ → n₁: ν̄ = R(1/n₁² − 1/n₂²). For Lyman first line:
n₂=2 → n₁=1: R(1 − 1/4) = 3R/4.
Ratio of radii of 2nd Bohr orbit of He⁺ to 1st Bohr orbit of H:
r ∝ n²/Z; (4/2)/(1/1) = 2.
Structure of Atom — FAQs
What are the key concepts in Class 11 Chemistry Structure of Atom?+
This chapter covers atomic models, the quantum mechanical model, quantum numbers, and the rules for filling electrons into orbitals. Key ideas include Early models, Dual nature & uncertainty, Quantum numbers, Orbitals, Filling rules.
What does Class 11 Chemistry Chapter 2 (Structure of Atom) cover on XamBaaz?+
It covers 90 NCERT-aligned MCQs on "Structure of Atom" — 30 Easy, 30 Medium and 30 Hard — each with a timed quiz and an instant explanation, suitable for CBSE Board exams, JEE Main, JEE Advanced and NEET UG.
Are these "Structure of Atom" questions free to practise?+
Yes — sign in with Google to practise "Structure of Atom" free. Full unlimited access is ₹999/year (limited-time launch price), with no per-chapter charges.
How should I revise "Structure of Atom" for the exam?+
Start with the Easy quiz to confirm your fundamentals, then attempt Medium and Hard for application-level practice. Review each explanation, retry the questions you miss, and track your accuracy on this chapter until it is consistently high.
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