The bonding in ferrocene involves sharing of the 6 π electrons from each cyclopentadienyl ring with the iron atom. based on the electronic configuration of the iron species in ferrocene, show that a favorable 18-electron noble gas configuration is established at the iron atom.

Yes it is really occures.

Explanation:

Iron in ferrocene is Iron (II) which has 6 electrons on the d-orbitals. And cyclopentadiene provides all needed electrons to complete the 3 d level of Iron. And to go for the 4th energy level and cover that as well. Completely.

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.