Crack Science - Chapter 1 with this amazing quiz. “Structure of the Atom” is the 4 th chapter in the NCERT class IX science textbook. Atoms and molecules are the fundamental building blocks of matter. The existence of different kinds of matter is due to different atoms constituting them. Atoms are indivisible. One of the first indications is that atoms are not indivisible since there are smaller particles inside an atom. The particles that build an atom are called subatomic particles. * Covered in this part are the following: * Charged Particles in Matter * The structure of an atom * Thomson’s model of an atom * Rutherford’s model of an atom * Bohr’s model of atom * Neutrons This online quiz helps you to revise your portions.

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