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Chlorine
Chlorine is a greenish yellow poisonous gas, many people use chlorine to bleach their clothes, and swimming pools, because it kills bacteria that cause diseases.
Who discovered it:Carl Wilhem Scheele
When was it discovered:1774
Symbol:Cl
Group:7
Row:3
Number of Protons(+):17
Number of Neutrons:18
Number of Electrons(-):17
Atomic Mass: 35.453 u ± 0.002 u
Electron Configuration:[Ne]3s 3p
2
5
Cl
2
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