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General | |||||||||||||
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Name, Symbol, Number | Arsenic, As, 33 | ||||||||||||
Series | Metalloids | ||||||||||||
Group, Period, Block | 15 (VA), 4 , p | ||||||||||||
Density, Hardness | 5727 kg/m3, 3.5 | ||||||||||||
Appearance | metallic grey | ||||||||||||
Atomic Properties | |||||||||||||
Atomic weight | 74.92160 amu | ||||||||||||
Atomic radius (calc.) | 115 (114) pm | ||||||||||||
Covalent radius | 119 pm | ||||||||||||
van der Waals radius | 185 pm | ||||||||||||
Electron configuration | [Ar]3d10 4s2 4p3 | ||||||||||||
e- 's per energy level | 2, 8, 18, 5 | ||||||||||||
Oxidation states (Oxide) | +-3,5 (mildly acidic) | ||||||||||||
Crystal structure | Rhombohedral | ||||||||||||
Physical Properties | |||||||||||||
State of matter | solid | ||||||||||||
Melting point | 1090 K (1503 °F) | ||||||||||||
Boiling point | 887 K (1137 °F) | ||||||||||||
Molar volume | 12.95 ×10-3 m3/mol | ||||||||||||
Heat of vaporization | 34.76 kJ/mol | ||||||||||||
Heat of fusion | 369.9 kJ/mol | ||||||||||||
Vapor pressure | __ Pa at __ K | ||||||||||||
Speed of sound | __ m/s at __ K | ||||||||||||
Miscellaneous | |||||||||||||
Electronegativity | 2.18 (Pauling scale) | ||||||||||||
Specific heat capacity | 330 J/(kg*K) | ||||||||||||
Electrical conductivity | 3.45 106/m ohm | ||||||||||||
Thermal conductivity | 50 W/(m*K) | ||||||||||||
1st ionization potential | 947.0 kJ/mol | ||||||||||||
2nd ionization potential | 1798 kJ/mol | ||||||||||||
3rd ionization potential | 2735 kJ/mol | ||||||||||||
4th ionization potential | 4837 kJ/mol | ||||||||||||
5th ionization potential | 6043 kJ/mol | ||||||||||||
6th ionization potential | 12310 kJ/mol | ||||||||||||
Most Stable Isotopes | |||||||||||||
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SI units & STP are used except where noted. |
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Albertus Magnus is believed to have been the first to isolate the element in 1250. In 1649 Johann Schroeder[?] published two ways of preparing arsenic.
The most important compounds of arsenic are white arsenic, its sulfide, Paris green, calcium arsenate, and lead arsenate. Paris green, calcium arsenate, and lead arsenate have been used as agricultural insecticides and poisons. It is sometimes found native, but usually combined with silver, cobalt, nickel, iron, antimony, or sulfur.
See also:
wikipedia.org dumped 2003-03-17 with terodump