![]() ![]() įurthermore, chlorine reaches its boiling point at -34.6 ☌, while the melting point of this gas is achieved at -101 ☌. The solid form of chlorine occurs as calcium hypochlorite. It changes from a gaseous aggregate state into a liquid under pressure. Having an atomic mass of 35.45 g.mol -1 and electron configuration 3s2 3p5, chlorine is a chemical element that is heavier than air. The energy of the third ionization: 3822 kJ.mol -1ĭiscovery date: In 1774 by Carl Wilhelm Scheeleĭiatomic in nature (occurring as Cl 2 ), this yellow-green gaseous element with a pungent, irritating odor carries the symbol Cl and the atomic number 17 in the periodic table of elements. The energy of the second ionization: 2298 kJ.mol -1 The energy of the first ionization: 1255.7 kJ.mol -1 ![]() Most characteristic isotope: 35 Cl, 36 Cl, 37 Cl Half-life: From less than an hour, up to 301,300 ± 1,500 yearsĮlectronegativity according to Pauling: 3.16 The symbol in the periodic table of elements: (Cl)Ĭolor: Pale greenish-yellow gas at a room temperature / Clear, amber-colored liquid under applied pressure or at temperatures below -30☏ (-34☌) Fact Box Chemical and Physical Properties of Chlorine Being a member of the halogen family of periodic table elements, chlorine is a highly reactive chemical substance with seven valence electrons in its outer shell. It’s the twentieth most abundant element found in Earth’s crust, amounting to 130 ppm or 0.01 percent. Chlorine is a chemical element with an atomic number of 17 in the periodic table of elements. ![]()
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