Chemistry - Structure of Atom
Practise 9 IAT (IISER) previous year questions on Structure of Atom, compiled from papers spanning 2017 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty IAT (IISER) tests.
Structure of Atom has been asked in 8 of the 9 years of IAT (IISER) papers analysed (2017–2026), with 9 questions in all. 44% of them were easy, 33% moderate and 22% tough. Most of its questions came from 2026, with 1 question that year. In the last three years (2023–2026) it had 3 questions across 3 papers, about 1 per paper.
The chapter's 4 topics are not weighted equally: Quantum mechanical model (4 questions, 44%), Dual Behaviour of Matter and Heisenberg Uncertainty Principle (2 questions, 22%), and Bohr's model (2 questions, 22%) have been asked the most. Quantum mechanical model has also led over the last five years, with 2 questions. Quantum mechanical model has produced the most tough questions (1).
- 1What is the ratio of the velocity of an electron in the fourth orbit of to the velocity of the electron in the second orbit of ?2026Bohr's model
- 2What is the time period of revolution of an electron in the fourth Bohr orbit of ? [Bohr radius picometers, mass of an electron , Planck's c2025Bohr's model
- 3The minimum energy needed to remove an electron from a metal corresponds to a wavelength of 500 nm . What is the total kinetic energy of all2024Dual Behaviour of Matter and Heisenberg Uncertainty Principle
- 4How many radial nodes does have in its 4 s orbital?2023Quantum mechanical model
- 5Which of the following expressions represents the hydrogen atom wave function shown in the figure below? ( is the distance of the electron f2022Quantum mechanical model
- 6The probability density of an electron in 1s orbital for an H atom is maximum2021Quantum mechanical model
- 7The total number of nodes for a given principal quantum number , and azimuthal quantum number , are2020Quantum mechanical model
- 8The kinetic energy of the photoelectrons ejected from a metal on irradiation with light of frequency \(3.8 10^{16} {~Hz}\) is \(K\). When ir2018Dual Behaviour of Matter and Heisenberg Uncertainty Principle
- 9Consider a hypothetical case in which the charge of a proton is twice as that of an electron. Using this hypothetical case, how many protons2017Atomic Mass and Atomic Size
Frequently Asked Questions
1.How many questions are available for Structure of Atom?
This chapter includes 9 questions compiled from IAT (IISER) papers spanning 2017 to 2026.
2.Are these questions only from IAT (IISER), or from other exams too?
These are IAT (IISER) questions specifically for the Structure of Atom chapter. Questions from other exams like JEE Main or NTA Abhyas (JEE Main) are organised separately under their respective exam sections.
3.Is Structure of Atom an important chapter for IAT (IISER) Chemistry?
Structure of Atom has appeared in 9 of the 10 years of IAT (IISER) papers covered here, with 9 questions across 9 papers - about one per paper it appears in.
4.What is the difficulty level of Structure of Atom questions in IAT (IISER)?
Of the 9 questions analysed for this chapter, 44% are easy, 33% moderate and 22% tough. 2026 had the most, with 1 question.
5.Which topics in Structure of Atom should I focus on?
These topics have carried the most weightage in Structure of Atom:
- Quantum mechanical model - 4 questions (44%)
- Dual Behaviour of Matter and Heisenberg Uncertainty Principle - 2 questions (22%)
- Bohr's model - 2 questions (22%)
- Quantum mechanical model has produced the most tough questions (1).
6.Is Structure of Atom's weightage in IAT (IISER) going up or down?
Across all 9 papers analysed, Structure of Atom has averaged about 1.0 questions per paper. In the last three years (2023–2026), that average has stayed about the same, at about 1.0 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.