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Atomic Number and Mass Number

Chemistry

THE STRUCTURE OF THE ATOM AND THE PERIODIC TABLE

THE STRUCTURE OF THE ATOM AND THE PERIODIC TABLE 1.1 The structure of the atom When scientists started exploring matter, they realized that matter can be divided into smaller and still smaller particles. They called the smallest particle an ‘atom’. The name ‘atom’ was derived from the Greek word ‘atoms’, meaning ‘indivisible’. They discovered that the ‘atom’ maintains its chemical identity through all chemical and physical changes.   Dalton’s Atomic Theory John Dalton provided a simple theory of matter to provide theoretical justification to the laws of chemical combinations in 1805. The basic postulates of the theory are: All substances are made up of tiny, indivisible particles called atoms. Atoms of the same element are identical in shape, size, mass and other properties. Each element is composed of its own kind of atoms. Atoms of different elements are different in all respects. Atom is the smallest unit that takes part… Read More »THE STRUCTURE OF THE ATOM AND THE PERIODIC TABLE

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