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.


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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 3d10 4s2 4p3
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.

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
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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 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


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Ground State Electronic Configuration of Arsenic - neutral Arsenic atom

The ground state electronic configuration of Neutral Arsenic atom is 3d10 4s2 4p3. The portion of Arsenic configuration that is equivalent to the noble gas of the preceding period, is abbreviated as . 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.

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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)

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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

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

Compare Arsenic with all Group 15 elements

Arsenic vs Nitrogen Arsenic vs Phosphorus Arsenic vs Antimony Arsenic vs Bismuth Arsenic vs Moscovium

Compare Arsenic with all metalloid elements

Arsenic vs Boron Arsenic vs Silicon Arsenic vs Germanium Arsenic vs Antimony Arsenic vs Tellurium Arsenic vs Polonium