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.

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure  

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.