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Bohr Model

In: Computers and Technology

Submitted By inzi
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Postulates of Dalton’s Atomic Theory
The main points of Dalton’s atomic theory, an explanation of the structure of matter in terms of different combinations of very small particles, are given by the following postulates:
1. All matter is composed of indivisible atoms. An atom is an extremely small particle of matter that retains its identity during chemical reactions.
2. An element is a type of matter composed of only one kind of atom, each atom of a given kind having the same properties. Mass is one such property. Thus, the atoms of a given element have a characteristic mass.
3. A compound is a type of matter composed of atoms of two or more elements chemically combined in fixed proportions. The relative numbers of any two kinds of atoms in a compound occur in simple ratios. Water, for example, a compound of the elements hydrogen and oxygen, consists of hydrogen and oxygen atoms in the ratio of 2 to 1.
4. A chemical reaction consists of the rearrangement of the atoms present in the reacting substances to give new chemical combinations present in the substances formed by the reaction. Atoms are not created, destroyed, or broken into smaller particles by any chemical reaction.

Main Points of the Bohr Model
Postulate 1:
An electron in an atom moves in a circular orbit under the influence of coulomb attraction between the electron and the nucleus obeying the rules of classical mechanics.
Postulate 2:
An atom can exist in certain allowed or stationary states, with each state having a definite value for its total energy. When the atom is in one of these states it is stable and does not radiate energy. The total energy of an orbiting electron is quantized such that the electron’s angular momentum L has a set of discrete values given by equation (1) m= mass of electron…...

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