Arsenic
Element 33 of Periodic table is Arsenic with atomic number 33, atomic weight 74.9216. Arsenic, symbol As, has a Simple Trigonal structure and Silver color. Arsenic is a metalloid element. Trivial name of Arsenic is pentels, pnictogens*. Know everything about Arsenic Facts, Physical Properties, Chemical Properties, Electronic configuration, Atomic and Crystal Structure.
Arsenic is a chemical element with symbol As and atomic number 33. Arsenic occurs in many minerals, usually in conjunction with sulfur and metals, and also as a pure elemental crystal. Arsenic is a metalloid.
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Arsenic Facts
Read key information and facts about element Arsenic
| Name | Arsenic |
| Atomic Number | 33 |
| Atomic Symbol | As |
| Atomic Weight | 74.9216 |
| Phase | Solid |
| Color | Silver |
| Classification | metalloid |
| Group in Periodic Table | 15 |
| Group Name | nitrogen family |
| Period in Periodic Table | 4 |
| Block in Periodic Table | p-block |
| Electronic Configuration | |
| Melting Point | 817 °C |
| Boiling Point | 614 °C |
| Electronic Shell Structure | <2, 8, 18, 5> |
| CAS Number | CAS7440-38-2 |
Neighborhood
14
Si
15
P
16
S
32
Ge
33
As
34
Se
50
Sn
51
Sb
52
Te
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | |
| 1 | 1 H 2 He | |||||||||||||||||
| 2 | 3 Li 4 Be 5 B 6 C 7 N 8 O 9 F 10 Ne | |||||||||||||||||
| 3 | 11 Na 12 Mg 13 Al 14 Si 15 P 16 S 17 Cl 18 Ar | |||||||||||||||||
| 4 | 19 K 20 Ca 21 Sc 22 Ti 23 V 24 Cr 25 Mn 26 Fe 27 Co 28 Ni 29 Cu 30 Zn 31 Ga 32 Ge 33 As 34 Se 35 Br 36 Kr | |||||||||||||||||
| 5 | 37 Rb 38 Sr 39 Y 40 Zr 41 Nb 42 Mo 43 Tc 44 Ru 45 Rh 46 Pd 47 Ag 48 Cd 49 In 50 Sn 51 Sb 52 Te 53 I 54 Xe | |||||||||||||||||
| 6 | 55 Cs 56 Ba 72 Hf 73 Ta 74 W 75 Re 76 Os 77 Ir 78 Pt 79 Au 80 Hg 81 Tl 82 Pb 83 Bi 84 Po 85 At 86 Rn | |||||||||||||||||
| 7 | 87 Fr 88 Ra 104 Rf 105 Db 106 Sg 107 Bh 108 Hs 109 Mt 110 Ds 111 Rg 112 Cn 113 Nh 114 Fl 115 Mc 116 Lv 117 Ts 118 Og | |||||||||||||||||
| Lanthanides | 57 La 58 Ce 59 Pr 60 Nd 61 Pm 62 Sm 63 Eu 64 Gd 65 Tb 66 Dy 67 Ho 68 Er 69 Tm 70 Yb 71 Lu | |||||||||||||||||
| Actinide | 89 Ac 90 Th 91 Pa 92 U 93 Np 94 Pu 95 Am 96 Cm 97 Bk 98 Cf 99 Es 100 Fm 101 Md 102 No 103 Lr |
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How to Locate Arsenic on Periodic Table
Periodic table is arranged by atomic number, number of protons in the nucleus which is same as number of electrons. The atomic number increases from left to right. Periodic table starts at top left ( Atomic number 1) and ends at bottom right (atomic number 118). Therefore you can directly look for atomic number 33 to find Arsenic on periodic table.
Another way to read periodic table and locate an element is by using group number (column) and period number (row). To locate Arsenic on periodic table look for cross section of group 15 and period 4 in the modern periodic table.
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Table of Contents
History
Abundance
Physical Properties
Thermal Properties
Crystal Structure
Atomic & Orbital Properties
Chemical Properties
Isotopes
Health and Safety Parameters and Guidelines
Databases
Compare Arsenic with other elements
Arsenic History
The element Arsenic was discovered by Bronze Age in year 1250 in unknown place . Arsenic derived its name English word (Latin arsenicum)
Arsenic Presence: Abundance in Nature and Around Us
The table below shows the abundance of Arsenic in Universe, Sun, Meteorites, Earth"s Crust, Oceans and Human Body.
| Abundance in Universe | 8×10-7% |
| Abundance in Sun | N/A |
| Abundance in Meteorites | 1.8e-06 |
| Abundance in Earth"s Crust | 2.1e-06 |
| Abundance in Oceans | 2.3×10-7% |
| Abundance in Humans | 5×10-6% |
Crystal Structure of Arsenic
The solid state structure of Arsenic is Simple Trigonal.
The Crystal structure can be described in terms of its unit Cell. The unit Cells repeats itself in three dimensional space to form the structure.
Unit Cell Parameters
The unit cell is represented in terms of its lattice parameters, which are the lengths of the cell edges Lattice Constants (a, b and c)
| 375.98 | 375.98 | 1054.75 pm |
and the angles between them Lattice Angles (alpha, beta and gamma).
| π/2 | π/2 | 2 π/3 |
The positions of the atoms inside the unit cell are described by the set of atomic positions ( xi, yi, zi) measured from a reference lattice point.
The symmetry properties of the crystal are described by the concept of space groups. All possible symmetric arrangements of particles in three-dimensional space are described by the 230 space groups (219 distinct types, or 230 if chiral copies are considered distinct.
| Space Group Name | R_ 3m |  |
| Space Group Number | 166 | |
| Crystal Structure | Simple Trigonal |
Arsenic Atomic and Orbital Properties
Arsenic atoms have 33 electrons and the electronic shell structure is <2, 8, 18, 5> with Atomic Term Symbol (Quantum Numbers) 4S3/2.
| Atomic Number | 33 |
| Number of Electrons (with no charge) | 33 |
| Number of Protons | 33 |
| Mass Number | 75 |
| Number of Neutrons | 42 |
| Shell structure (Electrons per energy level) | <2, 8, 18, 5> |
| Electron Configuration | |
| Valence Electrons | 4s2 4p3 |
| Oxidation State | -3;-2;-1 1;2;3;4;5 |
| Atomic Term Symbol (Quantum Numbers) | 4S3/2 |
Shell Structure of Arsenic - Electrons per energy level
Ground State Electronic Configuration of Arsenic - neutral Arsenic atom
The ground state electronic configuration of Neutral Arsenic atom isSee more: Soul Shards: The Old Ways
Unabbreviated electronic configuration of neutral Arsenic
Complete ground state electronic configuration for the Arsenic atom, Unabbreviated electronic configuration
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p3
Atomic Structure of Arsenic
Arsenic atomic radius is 114 pm, while it"s covalent radius is 119 pm.
| Atomic Radius | 114 pm (1.14 Å)  Arsenic Chemical Properties: Arsenic Ionization Energies and electron affinityThe electron affinity of Arsenic is 78 kJ/mol
Ionization Energy of ArsenicRefer to table below for Ionization energies of Arsenic
Arsenic Physical PropertiesRefer to below table for Arsenic Physical Properties Arsenic is Conductor of electricity. Refer to table below for the Electrical properties of Arsenic
Arsenic Heat and Conduction Properties
Arsenic Magnetic Properties
Optical Properties of Arsenic
Acoustic Properties of Arsenic
Arsenic Thermal Properties - Enthalpies and thermodynamicsRefer to table below for Thermal properties of Arsenic
Enthalpies of Arsenic
Arsenic Isotopes - Nuclear Properties of ArsenicIsotopes of rhodium. Naturally occurring Arsenic has 1 stable isotope - 75As.
Regulatory and Health - Health and Safety Parameters and Guidelines
Database SearchList of unique identifiers to search the element in various chemical registry databases
Compare Arsenic with all Group 15 elementsArsenic vs Nitrogen Arsenic vs Phosphorus Arsenic vs Antimony Arsenic vs Bismuth Arsenic vs MoscoviumCompare Arsenic with all metalloid elementsArsenic vs Boron Arsenic vs Silicon Arsenic vs Germanium Arsenic vs Antimony Arsenic vs Tellurium Arsenic vs Polonium |