CBSE Class 9 Answered
How have you distributed the electrons in different shells? It doesn't follow the formula 2n squared & the rule that last shell will have 8 electrons.
Asked by Varsneya Srinivas | 14 Mar, 2015, 05:10: PM
Expert Answer
Distribution of Electrons in the Orbits
- According to Bohr’s model, electrons occupy certain stable orbits or shells. Each shell has a 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 (2n2), where n is the orbit number or shell number.
- The maximum number of electrons in different shells is 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 which 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.
Octet Rule
The Octet rule states that- ‘The maximum number of electrons that the outermost shell of an electrically neutral and chemically stable atom can have is 8.’
Exception: If the atom has only one shell, it can hold only 2 electrons. For example, hydrogen and helium can have only 2 electrons (duplet).
Answered by Hanisha Vyas | 16 Mar, 2015, 12:54: PM
Application Videos
Concept Videos
CBSE 9 - Chemistry
Asked by shivalaxmi0205 | 08 Mar, 2023, 07:47: PM
ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by rekhachaturvedu422 | 01 Aug, 2022, 04:16: PM
ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by pandeyabhishek1576 | 16 Feb, 2022, 01:24: PM
ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by senniasamy | 10 Jan, 2022, 08:48: PM
ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by nathdarshana | 20 Nov, 2020, 07:03: PM
ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by archanakad | 25 Aug, 2020, 08:59: PM
ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by namyairmalwar9803.5sdatl | 07 Jun, 2020, 01:47: PM
ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by fathima1012006 | 31 May, 2020, 10:44: AM
ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by gspublicschool | 27 Apr, 2020, 11:23: AM
ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by Jaiwanthsiva | 15 Apr, 2020, 01:51: PM
ANSWERED BY EXPERT