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Arsenic
33
Appearance
metallic grey
General properties
Name, simbolo , kaiphan
arsenic, As, 33
Pronunciation
Plantilya:IPAc-en Plantilya:Respell ,Plantilya:IPAc-en Plantilya:Respell when attributive
Element category metalloid
Group , period , block 15 , 4 , p
Standard atomic weight 74.92160(2)
Electron configuration [Ar ] 4s2 3d10 4p3
History
Discovery Early Bronze Age (2500 BC )
First isolation
Albertus Magnus (1250)
Physical properties
Phase magahi
Density (near r.t. )5.727 g·cm−3
Liquid density at m.p.
5.22 g·cm−3
Sublimation point 887 K, 615 °C, 1137 °F
Triple point 1090 K (817°C), 3628[1]
Critical point 1673 K, ? MPa
Heat of fusion (grey) 24.44 kJ·mol−1
Heat of vaporization ? 34.76 kJ·mol−1
Molar heat capacity 24.64 J·mol−1 ·K−1
Vapor pressure
P (Pa)
1
10
100
1 k
10 k
100 k
at T (K)
553
596
646
706
781
874
Atomic properties
Oxidation states 5 , 3 , 2, 1,[2] acidic oxide)
Electronegativity 2.18 (Pauling scale)
Ionization energies more )1st: 947.0 kJ·mol−1
2nd: 1798 kJ·mol−1
3rd: 2735 kJ·mol−1
Atomic radius 119 pm
Covalent radius 119±4 pm
Van der Waals radius 185 pm
Miscellanea
Crystal structure simple trigonal [3]
Magnetic ordering diamagnetic [4]
Electrical resistivity (20 °C) 333 nΩ·m
Thermal conductivity 50.2 W·m−1 ·K−1
Young's modulus 8 GPa
Bulk modulus 22 GPa
Mohs hardness 3.5
Brinell hardness 1440 MPa
CAS registry number 7440-38-2
Most stable isotopes
Main article: Isotopes of arsenic
· r
Ang arsenico (Iningles arsenic ) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga As ug kaiphan nga atomik 33. Ang arsenico mao ang metalloid .
↑ Gokcen, N. A (1989). "The As (arsenic) system". Bull. Alloy Phase Diagrams 10 : 11–22. doi :10.1007/BF02882166 ↑ Ellis, Bobby D. (2004). "Stabilized Arsenic(I) Iodide: A Ready Source of Arsenic Iodide Fragments and a Useful Reagent for the Generation of Clusters". Inorganic Chemistry 43 : 5981. doi :10.1021/ic049281s ↑ Arsenic , mindat.org↑ editor-in-chief, David R. Lide. (2000). "Magnetic susceptibility of the elements and inorganic compounds" . Handbook of Chemistry and Physics (81 ed.), CRC press. ISBN 0849304814 , http://www-d0.fnal.gov/hardware/cal/lvps_info/engineering/elementmagn.pdf .
