Enhance your IIT JEE preparation by surveying the atomic structure with the help of various preparation tips offered by askIITians. Read to know more:

1. Atomic Structure

2. History of Atom
It was the Greek philosopher Democritus (1460-370 BCE), who had a
thought in his mind for first time ever in history that if we start
breaking any matter in small particles continually, there will come a
point from where it will not be possible to break it further into
smaller particle. i.e. matter cannot be infinitely divided.
But the theory of Democritus was rejected by two other well-known
and more popular Greek Philosophers Aristotle and Plato. According to
them matter was made up of four elements, air, water, fire and earth.
It was only after 2000 years that someone supported the theory of
Democritus. Name of that person was John Dalton. He proposed a
theory known as Dalton’s atomic theory.

3. Dalton’s Atomic Theory

4. The various topics that form a part of atomic
structure include:
 Sub-atomic Particles
 Atomic models
 Dual nature of Matter
 Photoelectric Effect
 Electromagnetic Radiations
 Quantum Mechanical Model of Atoms
 Electronic Configuration
 Discovery of Electron Proton and Neutron
You can get details explanation for these subtopics on the study material page of
atomic structure.

5. Important Formulas

6. Atomic Models

7. How important is atomic structure for exams?
Atomic structure is a very important and comparatively easy to
score topic. Weightage of this chapter in IIT JEE, AIPMT and CBSE
is about 2%, 3% and 8% of the total marks respectively.

8. What are the best books for the preparation of Atomic
Structure?
Some of the books which are considered to be best for
preparation of this section are:
 J.D Lee
 O.P Tondon
 NCERT Text book
NCERT text books are one of the best books for preparing any
topic of chemistry for CBSE and AIPMT. For IIT JEE one should
refer to other books like J.D Lee and O.P Tondon also.

9. How to Prepare Atomic Structure for IIT JEE?
 First of all study this chapter from NCERT Text book. Read the chapter number of times and
try to understand each and every concept clearly.
 Take help of animation and videos which you will find easily on web, to understand the atomic
models, photoelectric effect and other related topics. It is very important to have a clear
picture of experimental setup and observations in your mind
 Once you get all the concepts of chapter, move to the numeric problems.
 Start with the solved examples given in the book and slowly move to the unsolved ones.
 Once you solve all the questions given in NCERT Text book, you can move to the other books
also and try to solve more problems given there.
 After finishing the NCERT Text book, you can try J.D Lee and O.P Tondon also to gain in
depth knowledge of the chapter.
 Look into the previous year question papers for the questions related to the atomic structure
and try to solve them all.
 You will find that most of the numeric problems are from Behr’s atomic theory and hydrogen
spectrum. These two topics are very important by exam. Try to solve as much questions as
possible from these two topics.

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