Top Strategies to Excel in JEE Main Atomic Structure Mock Tests
Atomic Structure is a foundational chapter in JEE Chemistry, setting the basis for understanding atomic models, electron configurations, and quantum theory. This mock test will help you consolidate key concepts like quantum numbers, Bohr’s model, and isotopes—crucial for scoring high in exams. Attempt this test to reinforce your learning and assess your preparation for JEE Main 2025.
Mock Test Instructions for the Atomic Structure Mock Test-3:
- 20 questions from Atomic Structure
- Time limit: 20 minutes
- Single correct answer per question
- Correct answers appear in bold green after submission
How Can JEE Mock Tests Help You Master Atomic Structure?
- Identify gaps in your understanding of quantum numbers and electron arrangements.
- Track improvements in concepts like atomic models, subatomic particles, and isotopes by taking regular tests.
- Boost speed and accuracy while solving MCQs on emission spectra and energy levels in atoms.
- Mock test analysis reveals typical mistakes in configuration and quantum theory applications.
- Receive immediate feedback and focus your revision where it matters for JEE Chemistry.
Master Atomic Structure with Expert-Designed JEE Mock Tests
- Understand fundamental laws like Hund’s rule and Pauli exclusion principle through targeted questions.
- Strengthen your problem-solving for atomic theory and previous year question patterns.
- Practice time management for challenging electron configuration questions.
- Mock tests expose you to exam-level MCQs on Bohr’s model, quantum numbers, and isotopic calculations.
- Get an edge in revision for atomic structure with curated, topic-specific mock test practice.
Subject-Wise Excellence: JEE Main Mock Test Links
| S.No. | Subject-Specific JEE Main Online Mock Tests |
|---|---|
| 1 | Online FREE Mock Test for JEE Main Chemistry |
| 2 | Online FREE Mock Test for JEE Main Maths |
| 3 | Online FREE Mock Test for JEE Main Physics |
Important Study Materials Links for JEE Exams
FAQs on Atomic Structure Mock Test for JEE Main 2025-26: Practice & Solutions
1. What is the atomic structure?
The atomic structure refers to the arrangement of subatomic particles—protons, neutrons, and electrons—within an atom. Protons and neutrons are located in the nucleus, while electrons revolve around the nucleus in specific energy levels or shells.
2. What are the main postulates of Dalton’s Atomic Theory?
Dalton’s Atomic Theory states that: (1) All matter is made up of indivisible atoms. (2) All atoms of a given element are identical in mass and properties. (3) Atoms of different elements have different masses and properties. (4) Atoms combine in simple whole-number ratios to form compounds.
3. Explain the significance of quantum numbers in atomic structure.
The quantum numbers (principal, azimuthal, magnetic, and spin) uniquely define the state and location of an electron in an atom. These numbers describe the energy level, shape, orientation, and spin direction of electron orbitals, helping to explain the electronic configuration and chemical behavior of elements.
4. What are the four types of quantum numbers?
(1) Principal quantum number (n): Indicates the main energy level. (2) Azimuthal quantum number (l): Represents the subshell or shape of the orbital. (3) Magnetic quantum number (m): Specifies the orientation of the orbital. (4) Spin quantum number (s): Shows the spin direction of the electron.
5. State Hund’s Rule and its importance in electron configuration.
According to Hund’s Rule, electrons occupy all the orbitals of a given subshell singly before any orbital is doubly occupied. This rule ensures maximum multiplicity and minimizes electron repulsion, resulting in the most stable arrangement of electrons in an atom.
6. What is an isotope? Give one example.
An isotope refers to atoms of the same element that have the same atomic number but different mass numbers due to varying numbers of neutrons. For example, Carbon-12 and Carbon-14 are isotopes of carbon.
7. Describe the Bohr model of the atom.
The Bohr model proposes that electrons move around the nucleus in fixed orbits with quantized energies. These orbits are called energy levels, where electrons can jump from one orbit to another by absorbing or emitting energy as photons.
8. What is the electronic configuration of sodium (Na)?
The electronic configuration of sodium (Na) (atomic number 11) is: 1s² 2s² 2p⁶ 3s¹.
9. Differentiate between paramagnetic and diamagnetic substances.
Paramagnetic substances have one or more unpaired electrons and are attracted by a magnetic field, whereas diamagnetic substances have all electrons paired and are slightly repelled by a magnetic field.
10. What is the significance of Heisenberg’s Uncertainty Principle?
The Heisenberg Uncertainty Principle states that it is impossible to simultaneously determine the exact position and momentum of an electron. This principle highlights the limitations of measuring subatomic particles and explains the probabilistic nature of electron locations in an atom.
11. Which experiment led to the discovery of the nucleus?
The Rutherford gold foil experiment led to the discovery of the atomic nucleus. By bombarding thin gold foil with alpha particles, Rutherford observed that some particles were deflected at large angles, indicating a small, dense, positively charged center called the nucleus.
12. What is Aufbau principle and how does it guide electron filling?
The Aufbau principle states that electrons fill atomic orbitals in order of increasing energy, starting from the lowest energy orbital. This principle helps predict the electronic configurations of elements according to the energy sequence: 1s < 2s < 2p < 3s < 3p < 4s < 3d, and so on.
