Name: Chlorine
Symbol: Cl
Atomic number: 17
Atomic weight: 35.453 amu
Standard state: gas at 298 K
Group in periodic table: 17
Group name:The Halogen
Period in periodic table: 3
Block in periodic table: p-block
Colour: yellowish green
Classification: Non-metallic
Number of protons: 17
Number of nuetrons: 18
Number of electrons: 17
Room temperature: it is a gas electron configuration: 1s2, 2s2, 2p6, 3s2, 3p5
Properties: Chlorine has a melting point of -100.98°C, boiling point of -34.6°C, density of 3.214 g/l, specific gravity of 1.56 (-33.6°C),Chlorine directly combines with almost all of the other elements. Chlorine gas is a greenish yellow. The liquid form will burn the skin. Humans can smell as low an amount as 3.5 ppm. A few breaths at a concentration of 1000 ppm is usually fatal.
Discovered in 1774 by a swedish scientist named Carl Wilhelm Scheele.
Uses: Chlorine is used in many everyday products. It is used for disinfecting drinking water. Chlorine is used in the production of textiles, paper products, dyes, petroleum products, medicines, insecticides, disinfectants, foods, solvents, plastics, paints, and many other products. The element is used to manufacture chlorates, carbon tetrachloride, chloroform, and in the extraction of bromine. Chlorine has been used as a chemical warfare agent.
Valence electrons: 7
In nature, chlorine is only found in the combined state, most commonly with sodium as NaCl and courthouse directions
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