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Consider the rules followed for writing the number of electrons in different energy levels or shells: 1. Electrons are not accommodated in a given shell unless the inner shells are filled. 2. The maximum number of electrons present in a shell is given by the formula 2n2. Which among the above statements is/are correct?

Consider the rules followed for writing the number of electrons in different energy levels or shells: 1. Electrons are not accommodated in a given shell unless the inner shells are filled. 2. The maximum number of electrons present in a shell is given by the formula 2n2. Which among the above statements is/are correct? Correct Answer Both 1 and 2

The correct answer is Both 1 and 2.

Key Points

  • The distribution of electrons into different orbits of an atom was suggested by Bohr and Bury.
  • The orbits or shells are represented by the letters K,L,M,N,… or the numbers, n=1,2,3,4,….
  • The following rules are followed for writing the number of electrons in different energy levels or shells:-
    • The maximum number of electrons present in a shell is given by the formula 2n2. ‘n’ is the orbit number or energy level index. Hence, statement 2 is correct.
    • The maximum number of electrons that can be accommodated in the outermost orbit is 8.
    • Electrons are not accommodated in a given shell unless the inner shells are filled. That is, the shells are filled in a step-wise manner. Hence, statement 1 is correct.

Additional Information

  • Neils Bohr put forward the following postulates about the model of an atom:-
    • Only certain special orbits known as discrete orbits of electrons, are allowed inside the atom.
    • While revolving in discrete orbits the electrons do not radiate energy.

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