Write the symbol for each of the following ions: A. the ion with a 1+ charge, atomic number 55, and mass number 133 B. the ion with 54 electrons, 53 protons, and 74 neutrons C. the ion with atomic number 15, mass number 31, and a 3− charge D. the ion with 24 electrons, 30 neutrons, and a 3+ charge 3. Write the symbol for each of the following ions: A. the ion with a 3+ charge, 28 electrons, and a mass number of 71 B. the ion with 36 electrons, 35 protons, and 45 neutrons C. the ion with 86 electrons, 142 neutrons, and a 4+ charge D. the ion with a 2+ charge, atomic number 38, and mass number 87 4. Determine the number of protons, neutrons, and electrons in the followi

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.

particle   p is an electron and particle q is a neutron