Chlorine
Symbol
Cl
Atomic Number
17
Atomic Weight
35.4527
Element Classification
Discovered By
Carl Wilhelm Scheele
Discovery Date
1774 (Sweden)
Name Origin
Greek: chloros (greenish yellow).
Density (g/cc)
1.56 (@ -33.6°C)
Melting Point (K)
172.2
Boiling Point (K)
238.6
Appearance
Greenish-yellow, disagreeable gas
Atomic Radius (pm)
n/a
Atomic Volume (cc/mol)
18.7
Covalent Radius (pm)
99
Ionic Radius
27 (+7e) 181 (-1e)
Specific Heat
0.477 (Cl-Cl)
Fusion Heat (kJ/mol)
6.41 (Cl-Cl)
Evaporation Heat (kJ/mol)
20.41 (Cl-Cl)
Thermal Conductivity (@25°C W/m K)
0.009
Debye Temperature (K)
n/a
Pauling Negativity Number
3.16
First Ionizing Energy (kJ/mol)
1254.9
Oxidation States
7, 5, 3, 1, -1
Electronic Configuration
[Ne] 3s2 3p5
Lattice Structure
Orthorhombic(ORC)
Lattice Constant
6.240
Lattice C/A Ratio
n/a
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