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# Summarize the Rules for Writing of Distribution of Electrons in Various Shells for the First Eighteen Elements. - CBSE Class 9 - Science

ConceptConcept of Electrons Distributed in Different Orbits (Shells)

#### Question

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

#### Solution

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 is given by 2n2 = 2×12 = 2

Similarly, for second orbit, it is 2n2 = 2×2= 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 stepwise manner i.e., the outer shell is not occupied with electrons unless the inner shells are completely filled with electrons.

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#### APPEARS IN

NCERT Solution for Science Textbook for Class 9 (2018 to Current)
Chapter 4: Structure of the Atom
Q: 6 | Page no. 54

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Solution Summarize the Rules for Writing of Distribution of Electrons in Various Shells for the First Eighteen Elements. Concept: Concept of Electrons Distributed in Different Orbits (Shells).
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