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Distribution of electrons in various shells.

Learning Objective:. Distribution of electrons in various shells. How are Electrons Distributed in Different Orbits (Shells)?. The distribution of electrons into different orbits of an atom was suggested by Bohr and Bury.

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Distribution of electrons in various shells.

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  1. Learning Objective: • Distribution of electrons in various shells.

  2. How are Electrons Distributed in Different Orbits (Shells)? The distribution of electrons into different orbits of an atom was suggested by Bohr and Bury. The energy of the K shell is the least while those of L, M, N and O shells increases progressively. We also know that any system that has least energy is the most stable.1st energy level is K shell 2nd energy level is L shell 3rd energy level is M shell 4th energy level is N shell and so on

  3. Bohr and Bury Scheme - Important Rules • Maximum number of electrons that can be accommodated in a shell is given by 2n2 where n = shell number • For 1st energy level, n = 1Maximum number of electrons in 1st energy level = 2n22 x (1) 2 = 2 • For 2nd energy level n = 2Maximum number of electrons in the 2nd energy level = 2n22 x 22 = 2 x 4 = 8 • For 3rd energy level n = 3Maximum number of electrons in the 3rd energy level = 2n2= 2x(3) 2= 2 x 9 = 18 • For 4th energy level n = 4 Maximum number of electrons in the 4th energy level = 2n2= 2x(4) 2= 2x16 = 32

  4. Bohr and Bury Scheme - Important Rules

  5. Electronic Configurations of Some Important Elements

  6. Geometric Representation of Atomic Structure Below are the examples onGeometric Representation of Atomic Structure Example: 1 24 Mg 12 • Steps: • The first 2 electrons will go to the 1stshell = K Shell (2n2) • The next shell L takes a maximum of 8 electrons (2n2) • In this way 2 + 8 = 10 electrons have been accommodated. The next 2 electrons go to the M Shell.

  7. Atomic structures of the First Twenty Elements

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