Match each vocabulary term to its definition.
a. electrons
b. metals
c. period
d. compound
e. solution
f. protons
g. group
h. metalloids
definition:
1. a horizontal row on the periodic table
2. negatively charged, subatomic particles
3. elements that are malleable, polish to a luster, conduct heat and electricity well and tend to lose electrons in a chemical reaction
4. a vertical column on the periodic table
5. elements with properties intermediate between those of metals and nonmetals
6. a homogeneous mixture whose particles are too small to reflect or scatter light
7. positively charged, subatomic particles found in the nucleus of the atom
8. two or more elements that have chemically combined

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.