NCERT Solutions for Class 9 Science Unit 4
Structure of the Atom Class 9
Unit 4 Structure of the Atom Exercise Solutions
The basic building blocks of the "normal" matter that we see in the Universe are atoms, and combinations of atoms that we call molecules. We first consider atoms and then molecules. However, we shall see that although "normal matter" is composed of atoms and molecules, most of the matter in the Universe is not in the form of atoms or molecules, but rather in the form of a plasma. We discuss plasmas in the next section