How many electrons would be in the second shell of an
Atom with the atomic number 7?

5

Explanation:

Atomic number of atom = 7

 The atomic number is the number of protons in an atom. For most neutral compounds, the atomic number is the same as number of electrons. This specie has 7 electrons;

   Shell configuration;

    Number of electrons = 7

  Configuration = 2, 5

Number electrons in the second shell  = 5

introduction of a drug directly into the respiratory tract is a form of inhalation administration.

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.