Q) In an atom the maximum number of electrons in the outermost shell is 8 and the electrons cannot be furthur placed in a new shell unless the previous shell is filled completely. Then the maximum number of electrons in the third shell should be 8 ,as it becomes the outermost shell at that time because unless it is filled completely only then electrons can be fitted in the next shell. Then how (2n)square rule is correct? according to it the maximum number of electrons should be 18???Please can you solve my query???

Asked by banerjee_milky | 23rd Nov, 2017, 09:46: PM

Expert Answer:

  • The maximum number of electrons in different shells is as follows:
    • In M shell there are total 18 electrons which are distributed in s,p and d shells because of there is the addition of new d orbital which contains 10 electrons the total no. of electrons become 18.
    • elements containing d and f orbital shows variable valencies, bonding, shape and geometry. hence octet rule is mostly applicable to only s and p orbital containing elements.

Answered by Ramandeep | 24th Nov, 2017, 10:43: AM