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Home/ Questions/Q 4760
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Brinda
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Brinda
Asked: December 13, 20202020-12-13T05:39:32+00:00 2020-12-13T05:39:32+00:00In: Class 9 Science

Summarize the rules for writing of distribution of electrons in various shells for the first eighteen elements.

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NCERT Solutions for Class 9 Science Chapter 4
Structure of the Atom
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Exercises Questions
Page No-54
Questions No- 6

2020-2021cbsechapter 4class 9 scienceclass10ncertsciencestructure of the atom
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    1. Chemistry teacher
      2020-12-13T05:41:16+00:00Added an answer on December 13, 2020 at 5:41 am

      The rules for writing of the distribution of electrons in various shells for the first eighteen elements are given below:
      (i) The maximum number of electrons that a shell can accommodate is given by the formula ‘2n²’, where ‘n’ is the orbit number or energy level index (n = 1, 2, 3…).
      The maximum number of electrons present in an orbit of n = 1 given by 2n² = 2 × 1² = 2 Similarly, for second orbit, it is 2n² = 2 × 2² = 8 For third orbit, it is 2n² = 2 × 3² = 18 And so on ….. (ii) The outermost orbit can be accommodated by a maximum number of 8 electrons.
      (iii) Shells are filled with electrons in a step wise manner i.e., the outer shell is not occupied with electrons unless the inner shells are completely filled with electrons.

      For more answers visit to website:
      https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-4/

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