Rules for writing of distribution of electrons in various shells for the first 18 elements
The various rules for writing of distribution of electrons in various shells of an atom are as follows :(0 Ttu? maximum number of electrons which can be accommodated in any energy level of the atom of an element is given by (where n is the number of that energy level).By using this relation we will find that:
(a) the maximum number of electrons which can be accommodated in 1st energy level (n = 1) or K shell is 2 x= 2 x 1 = 2
(b) the maximum number of electrons which can be accommodated in 2nd energy level ( n = 2) or L shell is 2 x =2x4 = 8.
(c) the maximum number of electrons which can be accommodated in 3rd energy level (n = 3) or M shell is 2 x = 2 x 9 = 18
(d) the maximum number of electrons which can be accommodated in 4th energy level (n = 4) or N shell is 2 x = 2 x 16 = 32.
(ii) The outermost shell of an atom cannot accommodate more than 8 electrons, even if it has the capacity to accommodate more electrons (If,however, the outermost shell of an atom is the first shell or K shell,then it cannot accommodate more than 2 electrons).
(iii) The electrons in an atom do not occupy a new shell unless all the inner shells are completely filled with electrons.This means that first all the electrons fill K shell,then L shell, then M shell,then N shell,and so on.
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Structure of the Atom - Notes
1. Drawback of Rutherford’s Model of the Atom
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2. Rutherford’s Experiment - Discovery of Nucleus
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4. For the symbols H, D and T,tabulate three sub-atomic particles found in each of them.
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9. Structure of The Atom - Study Points
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10. Limitations of Rutherford's model of the atom
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11. Arrangement Of Electrons In The Atoms
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12. All about Names of the Chemical Elements
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17. How to learn naming Chemical Formulae?
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22. Rules for writing of distribution of electrons in various shells for the first 18 elements
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24. Electronic Configurations of First 20 Elements
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25. Comparison between Proton, Neutron and Electron
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33. The Physical Properties of the Isotopes of an Element are Different
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39. All the Isotopes of an Element Have Identical Chemical Properties
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42. Relationship Between Mass Number and Atomic Number
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44. Electronic Configurations of Noble Gases (or Inert Gases)
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50. Applications of Radioactive Isotopes
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