
Chlorine (Cl) is a chemical element of the periodic table, located in the group 17 and the period 3, and is having the atomic number 17. It is a pale, greenish-yellow gas, whose name comes from the Greek word “chloros”, which means greenish yellow. It is a reactive nonmetal and is the 19th most abundant element on earth. It is the second lightest halogen, after the fluorine element.
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– p block |
FAQs on Chlorine Element
Chlorine |
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‣ What does chlorine look like? Appearance: pale yellow-green gas |
‣ When was chlorine discovered and by whom? Discovery and first isolation: Carl Wilhelm Scheele (1774) Recognized as an element by: Humphry Davy (1808) |
‣ Where is chlorine located on the periodic table?![]() Location: Chlorine is found in the third row of the periodic table, next to the sulfur element. |
‣ What is chlorine atomic number? Atomic number (Z): 17 |
‣ What is chlorine symbol? Symbol: Cl |
‣ What is the atomic weight of chlorine? Standard atomic weight: [35.446, 35.457] conventional: 35.45 |
‣ Chlorine belongs to which block? Block: p-block |
‣ What group does chlorine belong to? Group: 17 (halogens) |
‣ What period is chlorine in on the periodic table? Period: 3 |
‣ What is the covalent radius of chlorine? Covalent radius: 102±4 pm |
‣ Chlorine Van der Waals radius: 175 pm |
‣ What is chlorine’s melting point? Melting point: (Cl2) 171.6 K (-101.5 °C, -150.7 °F) |
‣ What is the boiling point of chlorine? Boiling point: (Cl2) 239.11 K (-34.04 °C, -29.27 °F) |
‣ Chlorine critical point: 416.9 K, 7.991 MPa |
‣ How many electron shells does chlorine have? Electrons per shell: 2, 8, 7 |
‣ What is the electron configuration of chlorine (cl)? Electron configuration: [Ne] 3s2 3p5 |
‣ What is chlorine ionization energy? Ionization energies: 1st: 1251.2 kJ/mol 2nd: 2298 kJ/mol 3rd: 3822 kJ/mol |
‣ What phase is chlorine normally found in? Phase (at r.t): gas |
‣ What is chlorine’s density? Density (at STP): 3.2 g/L when liquid (at b.p): 1.5625 g/cm3 |
‣ Chlorine magnetic ordering: diamagnetic |
‣ Chlorine natural occurrence: primordial |
‣ What is chlorine oxidation state? Oxidation state: -1 |
‣ What is the chlorine electronegativity? Electronegativity: Pauling scale: 3.16 |
‣ Chlorine heat of fusion: (Cl2) 6.406 kJ/mol |
‣ Chlorine heat of vaporization: (Cl2) 20.41 kJ/mol |
‣ Chlorine molar heat capacity: (Cl2) 33.949 J/(mol K) |
‣ Chlorine molar magnetic susceptibility: -40.5 × 10-6 cm3/mol |
‣ Speed of sound in chlorine: 206 m/s (gas, at 0 °C) |
‣ What is the crystal structure of chlorine? Crystal structure: orthorhombic |
‣ Thermal conductivity of chlorine: 8.9 × 10-3 W/(m.K) |
‣ Chlorine electrical resistivity: >10 Ω.m (at 20 °C) |
‣ Chlorine CAS number: Cl2: 7782-50-5 |
‣ Chlorine vapor pressure
Vapor pressure | ||||||
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P (Pa) | 1 | 10 | 100 | 1 k | 10 k | 100 k |
at T (K) | 128 | 139 | 153 | 170 | 197 | 239 |
‣ How many isotopes does chlorine have?
Main isotopes of chlorine | ||||
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Isotope | Abundance | Half-life (t1/2) | Decay mode | Product |
35Cl | 76 % | stable | ||
36Cl | trace | 3.01 × 105 y | β– ε | 36Ar 36S |
37Cl | 24 % | stable |
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