electronic configuration

Asked by Harshal Saptarshi | 4th Sep, 2010, 11:07: PM

Expert Answer:

Electronic configration is the arrangement of electrons in shells according to their energy.
Energy of the orbitals are given below:
1s< 2s< 2p< 3s< 3p< 4s< 3d< 4p<5s< 4d< 5p< 6s< 4f< 5d< 6p> 7s
Aufbau principle.
in the ground state of an atom the electrons occupy the lowest energy orbital available to them.
Filling of orbitals occur according to the (n+l) rule or Bohr Bury's rule
1. orbitals are filled in increasing value of n+l.
2. For orbitals having same value of (n+l) the orbitals having lower value of n is filled up first. ex. 2p(n+l=2+1) and 3s(n+l=3+0) so both have same (n+l) value in this case orbital having lower value of n i.e. 2pwill be filled first.
Pauli exclusion principle.
No two electrons in an atom can have identical set of four quantum numbers.
Hund's rule
1. in p,d and f orbitals no pairing of electrons occur untill each orbital of the given sub shell contains one electron.
2. unpaired electrons in various orbitals of same subshell should have parallel spins.

Answered by  | 5th Sep, 2010, 08:50: AM

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