33
As
Arsenic
74.9215956
Basic Information
Bohr Model
Descriptive Numbers
Mass
Periodic Position
Classification
Abundance
Color
Atomic Radius
Temperature
Density
Heat
Electrical Resistance
Magnetic Properties
Elasticity
Hardness
Etymology
Discovery & Isolation
Production & Use
Radioactivity
Electron Affinity
Dipole Polarity
Lattice
Electron & Quantum
List of Compounds
Basic Information
Name
Arsenic
Atomic Number
33
Allotropes
Yellow Arsenic, Black Arsenic, Gray Arsenic
Appearance
Metallic gray
Refractive Index
1.001552
Phase At STP
Solid
Spectrum Image
Source
WikipediaBohr Model
Static
Interactive
Descriptive Numbers
CAS Number
7440-38-2
CID Number
{CID5359596, CID5359596, CID139279}
DOT Number
1558
RTECS Number
RTECSCG0525000
Mendeleev Number
95
Pettifor Number
89
Space Group Number
166
Glawe Number
90
Mass
Atomic Mass
74.9215956 Da
Uncertainty
0.000006
Periodic Position
X Position
15
Y Position
4
Period
4
Group
15
Classification
Block
p
Category
Metalloid
Geochemical
Semi-Volatile
Goldschmidt
Chalcophilic
Electrical Type
Conductive
Abundance
Urban Soil
0.0159 mg/kg
Seawater
3.7e-9 kg/L
Earth Crust
0.0000018 g
Human Body
0.000005 %
Solar System
0.0000066 mole ratio to silicon
Meteorites
0.00018 %
Color
Jmol
#BD80E3
Molcas Gv
#BD80E3
CPK
#FF1493
Atomic Radius
Empirical
115
Calculated
114
Van Der Waals
185
Bonding
185
Batsanov
205
Rahm
231
Dreiding
415
Uff
423
Mm3
236
Alvarez
188
Bragg
126
Covalent (Single Bound)
119
Covalent (Triple Bound)
106
Covalent (Cordero)
119
Covalent (Pyykko)
121
Covalent (Pyykko Double)
114
Covalent (Pyykko Triple)
106
Mendeleev
121
C12
148
Temperature
Melting/Freeze (WEL)
1090 °K
Melting/Freeze (CRC)
1090 °K
Melting/Freeze (LNG)
1090 °K
Boiling/Density (WEL)
887 °K
Boiling/Density (CRC)
876 °K
Boiling/Density (LNG)
888 °K
Boiling/Density (Zhang)
886 °K
Density
STP
5.727 kg/cm³
Solid (WEL)
5727 kg/cm³
Solid (CRC)
5750 kg/cm³
Solid (LNG)
5727 kg/cm³
Liquid (CR2)
5220 kg/cm³
Heat
Molar Volume
12.95 cm³/mol
Atomic Volume
13.1 cm³
Heat Of Fusion CRC
24.44 kJ/mol
Heat Of Fusion LNG
24.44 kJ/mol
Heat Of Fusion WEL
27.7 kJ/mol
Evaporation USE
32.4 kJ/mol
Evaporation WEL
32.4 kJ/mol
Evaporation Zhang
32.4 kJ/mol
Molar Heat
24.64 J/molK
Heat Capacity USE
0.328 J/gK
Heat Capacity CRC
24.64 J/gK
Heat Capacity LNG
24.64 J/gK
Heat Capacity WEL
24.6 J/gK
Adiabatic Index
N/A
Electrical Resistance
293k
333 nΩm
Magnetic Properties
Order
Diamagnetic
Susceptibility
-3.9e-9 m3/kg
Elasticity
Bulk Modulus
22 GPa
Youngs Modulus
8 GPa
Hardness
Mohs
3.5
Brinell
1440
Etymology
Description
It is a semi-metal element found in group 15. It has three allotropes: yellow, black and grey. It reacts with halogens, concentrated oxidizing acids and hot alkalis. Albertus Magnus is thought to be the first to isolate the element in 1250.
Language Of Origin
Syriac/Persian through Greek, Latin, Old French and Medieval English
Origin Of Word
From the English word (arsenicum in Latin)
Meaning
orpiment, zırnık
Symbol Origin
Hynanka of males
Etymological Description
Originally from the Greek word arsenikon, meaning "yellow zirnik", taken from Syriac (al-zarniqa) and Persian (zarnik). Arsenikon is related to the Greek arsenikos, meaning "masculine" or "strong". These words evolved into Latin arsenicum and Old French arsenic, which is the source of today's English word arsenic.
Discovery & Isolation
Observed/Predicted By
Middle Eastern alchemists
Observed/Discovery Year
before 815 AD
Isolated Sample By
Middle East
Isolated Sample Year
before 815 AD
Production & Use
Sources
It is found in mispixel (arsenopyrite).
Uses
Many of its compounds are fatally toxic. It is used as a herbicide and rat poison. It conducts electricity. It is used in semiconductors. Some of its compounds, known as arsenite, are used in making paint, wallpaper and ceramics.
Radioactivity
Half Life
Stable
Lifetime
Stable
Neutron Mass Absorption
0.002
Neutron Cross Section
4.3
Electron Affinity
Electron Affinity (eV)
0.804
Electron Affinity (kJ/mol)
77.65
Electron Affinity (pauling)
2.18
Electron Affinity (allen)
13.08
Electron Affinity (ghosh)
0.2068208
Dipole Polarity
Accepted
30
Uncertainty
1
C6 GB
260
C6 Coefficient
246
Lattice
Constant Internal Default Radius
4.13
Constant
375.98, 375.98, 1054.75
Strucutre
RHL
Angles
π/2, π/2, 2 π/3
Electron & Quantum
Oxidation States
−3,−2,−1,0,1,2,3,4,5
Electron Configuration
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p3
Quantum Number
4h/a
Electron Configuration Semantic
pattern 3d10 4c2 chpz
Shells-0
2
Shells-1
8
Shells-2
18
Shells-3
5
Ionization Energies-0
947
Ionization Energies-1
1798
Ionization Energies-2
2735
Ionization Energies-3
4837
Ionization Energies-4
6043
Ionization Energies-5
12310
List of Compounds
1-10 of 97 compounds
| Formula | Names |
|---|---|
| As | black arsenic arsenic black black amorphous arsenic gray arsenic arsenic gray crystalline rhombohedral arsenic metallic arsenic |
| As4 | yellow arsenic arsenic tetramer arsenic yellow crystalline cubic arsenic non-metallic arsenic tetraarsenic |
| AlAs | aluminum arsenide alumanylidynearsane aluminium arsenidealuminum monoarsenide |
| AsBr3 | arsenic tribromide arsenic bromide arsenic(III) bromide arsenous bromide |
| AsCl3 | arsenic trichloride arsenic butter arsenic chloridearsenic(III) chloride arsenious chloride arsenous chloride butter of arsenic fuming liquid arsenic trichloroarsane trichloroarsine |
| AsF3 | arsenic trifluoridearsenic fluoride arsenic(III) fluoride arsenous fluoride trifluoroarsine |
| AsF5 | arsenic pentafluoride arsenic pentfluoride arsenic(V) fluoride arsorane, pentafluoro- pentafluoridoarsenic |
| AsFe | iron arsenide iron monoarsenide |
| GaAs | gallium arsenide gallanylidynearsane gallium monoarsenide |
| AsH3 | arsine arsenic hydride arsenic trihydride arsenous hydride hydrogen arsenide |
