Structure of Atom is a Class 11 Chemistry chapter that carries about 3.2% of the Chemistry questions in NEET. Practise it with 42 questions covering 2 topics, each with an explanation.
Sets of 15 questions that adapt to your level, with an explanation for every answer.
Across the 13 previous year papers, Structure of Atom had 20 questions, about 1.5 a year. The most in one paper was 2, in AIPMT 2014.
| Paper | Questions from this chapter |
|---|---|
| NEET 2026 | 2 |
| NEET 2025 | 1 |
| NEET 2024 | 2 |
| NEET 2023 | 2 |
| NEET 2022 | 2 |
| NEET 2021 | 1 |
| NEET 2020 | 1 |
| NEET 2019 | 2 |
| NEET 2018 | 1 |
| NEET 2017 | 1 |
| NEET 2016 | 2 |
| Re-AIPMT 2015 | 1 |
| AIPMT 2014 | 2 |
8 questions from the practice bank, spread across the chapter's topics. The full set is in the app.
The wavenumber of the first line of the Balmer series of hydrogen is (R = 1.097 × 10⁷ m⁻¹):
Answer: C. 1.52 × 10⁶ m⁻¹
Why: ν̄ = R(1/4 − 1/9) = R × 5/36.
The number of radial nodes in a 3p orbital is:
Answer: C. 1
Why: Radial nodes = n − l − 1 = 3 − 1 − 1 = 1.
The radius of the second Bohr orbit of hydrogen is about (a₀ = 52.9 pm):
Answer: C. 212 pm
Why: rₙ = n² a₀ = 4 × 52.9 pm.
According to the Aufbau principle, electrons are filled into orbitals in order of:
Answer: B. increasing energy
Why: The Aufbau principle states that electrons occupy the lowest-energy orbitals available first, filling orbitals in order of increasing energy.
The wavelength of electromagnetic radiation of frequency 5 × 10¹⁴ Hz is (c = 3 × 10⁸ m/s):
Answer: A. 6 × 10⁻⁷ m
Why: λ = c/ν = 3 × 10⁸/5 × 10¹⁴ = 6 × 10⁻⁷ m (600 nm).
The total number of electrons that can occupy all the d orbitals of a given shell is:
Answer: A. 10
Why: There are five d orbitals and each holds two electrons.
The energy of the electron in the n = 2 orbit of the hydrogen atom is (E₁ = −2.18 × 10⁻¹⁸ J):
Answer: D. −5.45 × 10⁻¹⁹ J
Why: Eₙ = E₁/n² = −2.18 × 10⁻¹⁸/4.
In a multi-electron atom, the 4s orbital is filled before the 3d orbital because:
Answer: B. the 4s has a lower energy by the (n + l) rule
Why: The (n + l) values are 4 for 4s and 5 for 3d.
Structure of Atom carries about 3.2% of the Chemistry questions in NEET. Across the 13 previous year papers on NeetVictory it appeared 20 times, about 1.5 questions a year.
Structure of Atom is a Class 11 Chemistry chapter in the NCERT syllabus.
NeetVictory has 42 practice questions on Structure of Atom, each with an explanation, in sets of 15 that adapt to your level. This page shows a free sample.
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