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Summarise the rules for writing of distribution of electrons i
Science
Science

Class 9

NCERT

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NCERT
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Chapter 3: Atoms and Molecules

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Chapter 4: Structure of the Atom

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Q1
Compare all the proposed models of an atom given in this chapter.
Q2
Summarise the rules for writing of distribution of electrons in various shells for the first eighteen elements.
Q3
Define valency by taking examples of silicon and oxygen.
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Summarise the rules for writing of distribution of electrons in various shells for the first eighteen elements.

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Updated on: Jan 31, 2024

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The following rules are followed for writing the distribution of electrons in different energy
levels or shells for the first eighteen elements :

(i) The maximum number of electrons present in a shell is given by the formula 2n2, where 'n' is the orbit
number or energy level index, 1,2,3,….Hence the maximum number of electrons in different shells are as
follows:
first orbit or K-shell will be = 2 × 12 = 2,
second orbit or L-shell will be = 2 × 22 = 8,
third orbit or M-shell will be = 2 × 32= 18,
fourth orbit or N-shell will be = 2 × 42= 32,

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

(iii) 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.
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Question Text
Summarise the rules for writing of distribution of electrons in various shells for the first eighteen elements.
Updated OnJan 31, 2024
TopicStructure of the Atom
SubjectScience
ClassClass 9
Answer TypeText solution:1 Video solution: 18
Upvotes1706
Avg. Video Duration7 min