Bohr -bury scheme of distribution of electrons?

CBSE Class 9
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Bohr -bury scheme of distribution of electrons?

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  • According to Bohr’s model, electrons occupy certain stable orbits or shells. Each shell has definite energy.

  • These orbits or shells are represented by the letters K, L, M, N, … or the numbers 1, 2, 3, 4, …

  • The maximum number of electrons present in the shell is given by the formula (2 n2), where n is the orbit number or shell number.

  • The maximum numbers of electrons in different shells are as follows:

  • The first orbit or K shell will have 2 × 12 = 2 electrons.

  • The second shell will have 2 × 22 = 8 electrons.

  • The third shell will have 2 × 32 = 18 electrons.

  • The fourth shell will have 2 × 42 = 32 electrons and so on.

  • The maximum number of electrons that can be accommodated in the outermost orbit is 8.

  • The orbits or shells are filled in a step-wise manner.

  • Electrons are not accommodated in a given shell unless the inner shells are filled.