NCERT Grade 9 Chapter 4 Structure of the Atom is a part of Unit I, Matter-Nature and Behaviour. In this chapter, an attempt is made to explain that atoms are not indivisible. Students are advised to go through the solutions given for the questions in this chapter to score well in the exams.The topic Charged Particles in Matter depicts that an atom is divisible and contains charged particles. The topic Structure of atom includes important theories such as Thomson’s model of an atom, Rutherford’s model of an atom, Bohr’s model of atom, neutrons. All these topics are explained with the help of detailed diagrams, explanatory text, and interactive activities. The solutions given for the in between exercises for these topics are easy, explanatory and interactive.
How are Electrons Distributed in Different Orbits (Shells)? tells about the theory explained by Bohr and Bury. The topic Valency explains about the electrons present in the outermost shell. The topic is accompanied by elaborative diagram and activities. The solutions given for the questions given in between the chapters are simple and precise and will further help the students in reinforcing the concept.
Since Atomic Number and Mass Number is also an important part of Structure of Atom, it has been explained with diagrams and in between exercises. Likewise, the topic Isotopes and Isobars describe how a number of atoms of some elements are identified. Solutions given to the questions of NCERT Chapter 4, Structure of the Atom deals with the mentioned concepts in a very simple and comprehensive manner and thus gives a better overview of the complete chapter. The unit I of NCERT Structure of the Atom of Grade 9 CBSE has questions for a total of 23 marks in the final examination paper as per the latest pattern.
Get 100 percent accurate NCERT Solutions for Class 9 Science Chapter 4 (Structure of The Atom) explained by expert Science teachers. We provide solutions for the questions given in Class 9 Science textbook as per CBSE Board guidelines from the latest NCERT book for Class 9 Science. The topics and sub-topics in Chapter 4 Structure of The Atom are given below.
Ex 4.1 - Charged Particles in Matter
Ex 4.2 - The Structure of an Atom
Ex 4.2.1 - THOMSON’S MODEL OF AN ATOM
Ex 4.2.2 - RUTHERFORD’S MODEL OF AN ATOM
Ex 4.2.3 - BOHR’S MODEL OF ATOM
Ex 4.2.4 - NEUTRONS
Ex 4.3 - How are Electrons Distributed in Different Orbits (Shells)?
Ex 4.4 - Valency
Ex 4.5 - Atomic Number and Mass Number
Ex 4.5.1 - ATOMIC NUMBER
Ex 4.5.2 - MASS NUMBER
Ex 4.6 - Isotopes
Ex 4.6.1 - ISOBARS.
We cover all exercises in the chapter given below:-
EXERCISE 4.1 - 2 Questions with Solutions
EXERCISE 4.2 - 4 Questions with Solutions
EXERCISE 4.3 - 2 Questions with Solutions
EXERCISE 4.4 - 2 Questions with Solutions
EXERCISE 4.5 - 1 Question with Solution
EXERCISE 4.6 - 2 Questions with Solutions
EXERCISE 4.7 - 2 Questions with Solutions
EXERCISE 4.8 - 19 Questions with Solutions.
Other than given exercises, you should also practice all the solved examples given in the book to clear your concepts on Structure of the Atom. Download the free PDF of Chapter 4 Structure of The Atom and take the print out to keep it handy for your exam preparation.