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Chlorine is a chemical element; it has symbol Cl and atomic number 17. The second-lightest of the halogens, it appears between fluorine and bromine in the periodic table and its properties are mostly intermediate between them. Chlorine is a yellow-green gas at room temperature.
Elemental chlorine is a pale, yellowy green gas at room temperature. It was the Greek word khlôros meaning 'yellowish-green' that was used as inspiration by Sir Humphrey Davy when he named this element in the 19th century.
5 Οκτ 2024 · Chlorine, chemical element of the halogen group that is a toxic, corrosive, greenish yellow gas, irritating to the eyes and respiratory system. Much chlorine is used to sterilize water and wastes, and the substance is employed either directly or indirectly as a bleaching agent for paper.
Chlorine has seventeen protons and eighteen neutrons in its nucleus, and seventeen electrons in three shells. It is located in group seventeen, period three and block p of the periodic table. Halogen element. Poisonous greenish-yellow gas.
Elemental chlorine was first prepared and studied in 1774 by Swedish chemist Carl Wilhelm Scheele. By 1810, the scientific consensus was that chlorine was actually a compound that contained oxygen. In 1811, Sir Humphry Davy concluded the new gas was in fact a new element.
31 Μαΐ 2015 · Chlorine is the third most abundant element in the Earth’s oceans. Chlorine is the 21st most abundant element in the Earth’s crust. Chlorine is the ninth most abundant element in the human body. Chlorine gas is has a yellow-green color and a strong smell. The smell of chlorine is an irritant.
5 Οκτ 2024 · Chlorine is a greenish yellow gas at room temperature and atmospheric pressure. It is two and a half times heavier than air. It becomes a liquid at −34 °C (−29 °F). It has a choking smell, and inhalation causes suffocation, constriction of the chest, tightness in the throat, and—after severe exposure— edema (filling with fluid) of the lungs.
