Matter is made up of atoms and molecules from "summary" of Chemistry Simplified NCERT Class 11 by Sanjay Sharma
The fundamental concept of chemistry is that matter is composed of tiny particles known as atoms and molecules. These particles are the building blocks of all substances in the universe. Atoms are the smallest units of an element that retain the chemical properties of that element. Molecules, on the other hand, are formed when two or more atoms combine chemically. Atoms consist of a nucleus containing protons and neutrons, surrounded by electrons in various energy levels or shells. The number of protons in the nucleus determines the identity of the atom, known as the atomic number. The atomic mass is the sum of protons and neutrons in the nucleus. Elements are classified based on their atomic numbers, which determine their unique properties. Molecules are formed when atoms ...
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