Please wait...
1800-212-7858 (Toll Free)
9:00am - 8:00pm IST all days
8104911739
For Business Enquiry

or

Thanks, You will receive a call shortly.
Customer Support

You are very important to us

For any content/service related issues please contact on this toll free number

022-62211530

Mon to Sat - 11 AM to 8 PM

Explain distribution of electrons in different shells with examples.

Asked by singhaivk05 27th January 2015, 6:59 PM
Answered by Expert
Answer:

Electrons tend to arrange themselves around nuclei so that they have the lowest possible energy. They would all like to get into the lowest energy level, sometimes called the K-shell, but are prevented from doing so by some rules that pop up in quantum mechanics. You can see how electrons are arranged in a particular atom by taking a look at our Periodic Table of Elements.

Example: The electronic configuration of Oxygen is 1s22s22p4

 

Thus, there are four shells in an atom namely K, L, M, N. In these shells, electrons are added in a systematical manner with the formula 2N2.

Energy Level

  Sub-shells

    Number of Electrons

1 (K-shell)

   s

     2

2 (L-shell)

   s, p

     8 (2 in s, 6 in p)

3 (M-shell)

   s, p, d

     18 (2 in s, 6 in p, 10 in d)

4 (N-shell)

   s, p, d, f

     32 (2 in s, 6 in p, 10 in d, 14 in f)




The rules of placing electrons within shells is known as the Aufbau principle. These rules are:

  1. Electrons are placed in the lowest energetically available subshell.
  2. An orbital can hold at most 2 electrons.
  3. If two or more energetically equivalent orbitals are available (example, p and d) then electrons should be spread out before they are paired up (Hund’s rule).
Answered by Expert 28th January 2015, 11:28 AM
Rate this answer
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10

You have rated this answer /10

Your answer has been posted successfully!

Latest Questions

CBSE XII Humanities History
Asked by kunals1713 20th July 2019, 4:02 AM
CBSE XI Science Mathematics
Asked by rajkishorjubilee46 20th July 2019, 3:34 AM
CBSE IX Mathematics
Asked by tanvichopra83 20th July 2019, 2:22 AM

Chat with us on WhatsApp