In a piece of silver, where would you find the valence electrons? (a) moving freely between the cations (b) attached to anion (c) attached the cation (d) shared between a cation and anion

Option (A) is the correct answer.

Explanation:

The valence electrons are the electrons which are present in the outermost shell of an atom.  

A silver atom contains a positive charge as silver is a cation.

In a piece of silver, the silver atoms will be linked together. As it is known that silver is a cation, it will hold a positive charge.

Therefore, it can be concluded that in a piece of silver, the valence electrons will be moving freely between the cations.

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.