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| General
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| Name, Symbol, Number
| chlorine, Cl, 17
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| Series
| halogens
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| Group, Period, Block
| 17 (VIIA), 3, pThe p-block of the periodic table of elements consists of the last six groups. In the elemental form of the p-block elements, the highest energy electron occupies a p- orbital. The p-block contains all of the nonmetals and semimetals, as well as some of t
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| DensityFor other meanings of density, see density (disambiguation Density (symbol: rho Greek: rho) is a measure of mass per unit of volume. The higher an object's density, the higher its mass per volume. The average density of an object equals its total mass div, Hardness
| 3.214 kg/m3Kilogram per cubic metre is the SI measure of density and is represented as kg/m³, where kg stands for kilogram and m³ stands for cubic metre. The density of water is about 1000 kg/m³, since a cubic metre of water weighs about a tonne. kg/m³" is sometimes (273 KThe kelvin (symbol: K is the SI unit of temperature, and is one of the seven SI base units. It is defined by two facts: zero kelvin is absolute zero (when molecular motion stops), and one kelvin is the fraction 1/273. 16 of the thermodynamic temperature o), NA
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| AppearanceFor alternative meanings, see color (disambiguation). visual arts. Color (or colour is a sensation which (in humans) derives from the ability of the fine structure of the eye to distinguish three differently filtered analyses of a view. The perception of
| yellowish green
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| Atomic properties
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| Atomic weightIn reference to a certain isotope of a chemical element, atomic weight (more accurately relative atomic mass though also called simply atomic mass is the mass of one atom of the isotope expressed in units atomic mass unit amu) such that the Carbon-12 isot
| 35.5 amuTo help compare different orders of magnitude we list here masses between 6. 02 amu and 60. 2 amu (10-26 kg and 10-25 kg). See also masses of other orders of magnitude. lighter masses 6. 941 amu atomic mass of lithium 44. 955910 amu atomic mass of scandiu
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| Atomic radius (calc.)
| 100 pm (79) pm
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| Covalent radius
| 99 pm
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| van der Waals radius
| 175 pm
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| Electron configuration
| [ Ne]3s2 3p5
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| e-'s per energy level
| 2, 8,7
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| Oxidation states ( Oxide)
| ±1,3,5,7 (strong acid)
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| Crystal structure
| orthorhombic
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| Physical properties
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| State of matter
| gas ( nonmagnetic)
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| Melting point
| 171.6 K (-150.52 ° F)
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| Boiling point
| 239.11 K (-29.002 °F)
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| Molar volume
| 17.39 ×10-6 m3/mol
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| Heat of vaporization
| 10.2 kJ/mol
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| Heat of fusion
| 3.203 kJ/mol
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| Vapor pressure
| 1300 Pa
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| Speed of sound
| no data
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| Miscellaneous
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| Electronegativity
| 3.16 ( Pauling scale)
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| Specific heat capacity
| 480 J/(kg*K)
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| Electrical conductivity
| no data
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| Thermal conductivity
| 0.0089 W/(m*K)
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| 1st ionization potential
| 1251.2 kJ/mol
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| 2nd ionization potential
| 2298 kJ/mol
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| 3rd ionization potential
| 3822 kJ/mol
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| 4th ionization potential
| 5158.6 kJ/mol
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| 5th ionization potential
| 6542 kJ/mol
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| 6th ionization potential
| 9362 kJ/mol
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| 7th ionization potential
| 11018 kJ/mol
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| 8th ionization potential
| 33604 kJ/mol
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| 9th ionization potential
| 38600 kJ/mol
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| 10th ionization potential
| 43961 kJ/mol
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| Most stable isotopes
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| SI units & STP are used except where noted.
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