What are the origins of the word Chlorine ?
The name originates from the Greek word 'khloros' meaning green referring to the color of the gas.

Facts about the Classification of the Element Chlorine
Chlorine is classified as an element in the 'Halogens' section which can be located in group 7 of the Periodic Table. The term "halogen" means "salt-former" and compounds containing halogens are called "salts". The halogens exist, at room temperature, in all three states of matter - Gases such as Fluorine & Chlorine, Solids such as Iodine and Astatine and Liquid as in Bromine.

Brief Facts about the Discovery and History of the Element Chlorine
Chlorine was discovered by Carl Wilhelm Scheele in 1774. Chlorine was given its name in 1810 by Humphrey Davy.

Occurrence of the element Chlorine
Obtained from Earth's oceans salt. Found only as the chloride ion. 1.9% of the mass of seawater is in chloride ions

Common Uses of Chlorine
Bleaches
Mustard gas
Water purification
Production of chlorates
Paper production
Antiseptic
Insecticides
Paint
Plastics
Medicines
Hypochlorous acid
Chlorine dioxide

The Properties of the Element Chlorine
Name of Element : Chlorine
Symbol of Element : Cl
Atomic Number of Chlorine : 17
Atomic Mass: 35.4527 amu
Melting Point: -100.98 °C - 172.17 °K
Boiling Point: -34.6 °C - 238.55 °K
Number of Protons/Electrons in Chlorine : 17
Number of Neutrons in Chlorine : 18
Crystal Structure: Orthorhombic
Density @ 293 K: 3.214 g/cm3
Color of Chlorine : greenish-yellow