Chlorine

Chlorine (from the Greek language Chloros, meaning "pale green"), is the chemical element with atomic number 17 and symbol Cl. It is a halogen, found in the periodic table in group 17. As part of common salt and other compounds, it is abundant in nature and necessary to most forms of life, including the human body. As chlorine gas, it is greenish yellow, is two and one half times as heavy as air, has an intensely disagreeable suffocating odor, and is exceedingly poisonous. In its liquid and solid form it is a powerful oxidizing, bleaching, and disinfecting agent.

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Greek language: Greek (Greek ????????, IPA ? "Hellenic") constitutes its own branch of the Indo-European languages. It has a documented history of 3,500 years, the longest of any Indo-European language. It is spoken by 15 million people primarily in Greece and Cyprus, but also in many Greek emigrant communities ar...

Chemical element: A chemical element, often called simply element, is the class of atoms which contain the same number of protons....

Atomic number: The atomic number (Z) is a term used in chemistry and physics to represent the number of protons found in the nucleus of an atom. In an atom of neutral charge, the number of electrons typically equals the atomic number....