As Arsenic – Element Information, Facts, Properties, Trends,Uses, Comparison with other elements

33
As
Arsenic

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.

33 As - Arsenic | SchoolMyKids

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.

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.

Table of Contents

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.

  Ppb by weight (1ppb =10^-7 %)
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)

a b c
375.98 375.98 1054.75 pm

and the angles between them Lattice Angles (alpha, beta and gamma).

alpha beta 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 33 As Arsenic - Crystal Structure | SchoolMyKids
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 [Ar] 3d10 4s2 4p3
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

33 As Arsenic - Electron Shell Structure | SchoolMyKids
n s p d f
1 K 2
2 L 2 6
3 M 2 6 10
4 N 2 3

Ground State Electronic Configuration of Arsenic - neutral Arsenic atom

The ground state electronic configuration of Neutral Arsenic atom is [Ar] 3d10 4s2 4p3. The portion of Arsenic configuration that is equivalent to the noble gas of the preceding period, is abbreviated as [Ar]. For atoms with many electrons, this notation can become lengthy and so an abbreviated notation is used.This is important as it is the Valence electrons 3d10 4s2 4p3, electrons in the outermost shell that determine the chemical properties of the element.

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)

Atomic Volume 13.0821721669 cm3
Covalent Radius 119 pm (1.19 Å)
Van der Waals Radius 185 pm
Neutron Cross Section 4.3 σa/barns

Atomic Spectrum of Arsenic

Atomic Spectrum of Arsenic | SchoolMyKids

Arsenic Chemical Properties: Arsenic Ionization Energies and electron affinity

The electron affinity of Arsenic is 78 kJ/mol

Valence 5
Electronegativity 2.18
ElectronAffinity 78 kJ/mol

Ionization Energy of Arsenic

Refer to table below for Ionization energies of Arsenic

Ionization energy number Enthalpy - kJ/mol
1 947
2 1798
3 2735
4 4837
5 6043
6 12310

Arsenic Physical Properties

Refer to below table for Arsenic Physical Properties

Density 5.727 g/cm3
Molar Volume 13.0821721669 cm3

Elastic Properties

Young Modulus 8 GPa
Shear Modulus N/A
Bulk Modulus 22 GPa
Poisson Ratio N/A

Hardness of Arsenic - Tests to Measure of Hardness of Element

Mohs Hardness 3.5 MPa
Vickers Hardness N/A
Brinell Hardness 1440 MPa

Arsenic Electrical Properties

Arsenic is Conductor of electricity. Refer to table below for the Electrical properties of Arsenic

Electrical Conductivity 3.3×106 S/m
Resistivity 3×10-7 m Ω
Superconducting Point N/A

Arsenic Heat and Conduction Properties

Thermal Conductivity 50 W/(m K)
Thermal Expansion N/A

Arsenic Magnetic Properties

Magnetic Type Diamagnetic
Curie Point N/A
Mass Magnetic Susceptibility -3.9×10-9
Molar Magnetic Susceptibility -2.92×10-10
Volume Magnetic Susceptibility -2.23e-05

Optical Properties of Arsenic

Refractive Index 1.001552

Acoustic Properties of Arsenic

Speed of Sound N/A

Arsenic Thermal Properties - Enthalpies and thermodynamics

Refer to table below for Thermal properties of Arsenic

Melting Point 1090 K (817 °C)
Boiling Point 887 K (614 °C)
Critical Temperature N/A
Superconducting Point N/A

Enthalpies of Arsenic

Heat of Fusion 27.7 kJ/mol
Heat of Vaporization 32.4 kJ/mol
Heat of Combustion {"N/A", "N/A", "N/A"} J/(kg K)

Arsenic Isotopes - Nuclear Properties of Arsenic

Isotopes of rhodium. Naturally occurring Arsenic has 1 stable isotope - 75As.

Isotope Isotope Mass % Abundance T half Decay Mode
60As  
61As  
62As  
63As  
64As  
65As  
66As  
67As  
68As  
69As  
70As  
71As  
72As  
73As  
74As  
75As   100% Stable N/A
76As  
77As  
78As  
79As  
80As  
81As  
82As  
83As  
84As  
85As  
86As  
87As  
88As  
89As  
90As  
91As  
92As  

Regulatory and Health - Health and Safety Parameters and Guidelines

CAS Number CAS7440-38-2
RTECS Number {N/A, RTECSCG0525000, N/A}
DOT Hazard Class {N/A, 6.1, N/A}
DOT Numbers "N/A", {1558}, "N/A"
EU Number {N/A, N/A, N/A}
NFPA Fire Rating {N/A, 2, N/A}
NFPA Hazards N/ A, N/ A, N/ A
NFPA Health Rating {N/A, 3, N/A}
NFPA Reactivity Rating {N/A, N/A, N/A}
Autoignition Point N/A
Flashpoint N/A

Database Search

List of unique identifiers to search the element in various chemical registry databases

Database Identifier number
CAS Number - Chemical Abstracts Service (CAS) CAS7440-38-2
CID Number {CID5359596, CID5359596, CID139279}
Gmelin Number {N/A, N/A, N/A}
NSC Number {N/A, N/A, N/A}
RTECS Number {N/A, RTECSCG0525000, N/A}

List of Elements
1 H - Hydrogen
2 He - Helium
3 Li - Lithium
4 Be - Beryllium
5 B - Boron
6 C - Carbon
7 N - Nitrogen
8 O - Oxygen
9 F - Fluorine
10 Ne - Neon
11 Na - Sodium
12 Mg - Magnesium
13 Al - Aluminium
14 Si - Silicon
15 P - Phosphorus
16 S - Sulfur
17 Cl - Chlorine
18 Ar - Argon
19 K - Potassium
20 Ca - Calcium
21 Sc - Scandium
22 Ti - Titanium
23 V - Vanadium
24 Cr - Chromium
25 Mn - Manganese
26 Fe - Iron
27 Co - Cobalt
28 Ni - Nickel
29 Cu - Copper
30 Zn - Zinc
31 Ga - Gallium
32 Ge - Germanium
33 As - Arsenic
34 Se - Selenium
35 Br - Bromine
36 Kr - Krypton
37 Rb - Rubidium
38 Sr - Strontium
39 Y - Yttrium
40 Zr - Zirconium
41 Nb - Niobium
42 Mo - Molybdenum
43 Tc - Technetium
44 Ru - Ruthenium
45 Rh - Rhodium
46 Pd - Palladium
47 Ag - Silver
48 Cd - Cadmium
49 In - Indium
50 Sn - Tin
51 Sb - Antimony
52 Te - Tellurium
53 I - Iodine
54 Xe - Xenon
55 Cs - Cesium
56 Ba - Barium
57 La - Lanthanum
58 Ce - Cerium
59 Pr - Praseodymium
60 Nd - Neodymium
61 Pm - Promethium
62 Sm - Samarium
63 Eu - Europium
64 Gd - Gadolinium
65 Tb - Terbium
66 Dy - Dysprosium
67 Ho - Holmium
68 Er - Erbium
69 Tm - Thulium
70 Yb - Ytterbium
71 Lu - Lutetium
72 Hf - Hafnium
73 Ta - Tantalum
74 W - Tungsten
75 Re - Rhenium
76 Os - Osmium
77 Ir - Iridium
78 Pt - Platinum
79 Au - Gold
80 Hg - Mercury
81 Tl - Thallium
82 Pb - Lead
83 Bi - Bismuth
84 Po - Polonium
85 At - Astatine
86 Rn - Radon
87 Fr - Francium
88 Ra - Radium
89 Ac - Actinium
90 Th - Thorium
91 Pa - Protactinium
92 U - Uranium
93 Np - Neptunium
94 Pu - Plutonium
95 Am - Americium
96 Cm - Curium
97 Bk - Berkelium
98 Cf - Californium
99 Es - Einsteinium
100 Fm - Fermium
101 Md - Mendelevium
102 No - Nobelium
103 Lr - Lawrencium
104 Rf - Rutherfordium
105 Db - Dubnium
106 Sg - Seaborgium
107 Bh - Bohrium
108 Hs - Hassium
109 Mt - Meitnerium
110 Ds - Darmstadtium
111 Rg - Roentgenium
112 Cn - Copernicium
113 Nh - Nihonium
114 Fl - Flerovium
115 Mc - Moscovium
116 Lv - Livermorium
117 Ts - Tennessine
118 Og - Oganesson
Metalloid
Nonmetals
Other Nonmetals
Halogens Noble Gas
Metals
Alkali Metals Alkaline Earth Metals
Transition Metals Post-Transition Metals
Lanthanide Actinide