Arsenic Element (Periodic Table)

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Arsenic

Arsenic (As) is a chemical element of the periodic table, located in the group 15 and the period 4, and is having the atomic number 33. It is a brittle, silvery-grey metalloid, whose name comes from the Greek word “arsenikon”, which means the yellow pigment orpiment. It has three allotropes: grey, yellow and black. It is a member of the pnictogen group.

group
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
period
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
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
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
– p block

FAQs on Arsenic Element

Arsenic
‣ What does arsenic look like?

Appearance: metallic grey
‣ When was the element arsenic discovered and by who?

Discovery: Arabic alchemists (before AD 815)
‣ Where is arsenic located on the periodic table?

Arsenic Periodic Table

Location: Arsenic is found in the fourth row of the periodic table below the phosphorus element.
‣ What is arsenic atomic number?

Atomic number (Z): 33
‣ What is the chemical symbol for arsenic?

Symbol: As
‣ What is the atomic weight of arsenic?

Standard atomic weight: 74.921595
‣ What block is arsenic in the periodic table?

Block: p-block
‣ What group is arsenic in on the periodic table?

Group: 15 (pnictogens)
‣ Which period does arsenic belong to?

Period: 4
‣ What is the atomic radius of arsenic?

Atomic radius: empirical: 119 pm
‣ Arsenic covalent radius: 119±4 pm
‣ Arsenic Van der Waals radius: 185 pm
‣ What is arsenic’s melting point?

Melting point: 1089.95 K (816.8 °C, 1502 °F)
‣ What is the boiling point of arsenic?

Boiling point: 886.15 K (613 °C, 1135 °F)
‣ Arsenic sublimation point: 887 K (615 °C, 1137 °F)
‣ Arsenic critical point: 1673 K, ? MPa
‣ Arsenic triple point: 1090 K, 3628 kPa
‣ How many electron shells does arsenic have?

Electrons per shell: 2, 8, 18, 5
‣ What is the ground state electron configuration for arsenic?

Electron configuration: [Ar] 3d10 4s2 4p3
‣ Arsenic allotropes: grey (most common), yellow, black
‣ What is arsenic ionization energy?

Ionization energies:
1st: 947.0 kJ/mol
2nd: 1798 kJ/mol
3rd: 2735 kJ/mol
‣ In what phase is arsenic normally found?

Phase (at r.t): solid
‣ What is arsenic density?

Density (near r.t): 5.727 g/cm3
when liquid (at m.p): 5.22 g/cm3
‣ Arsenic magnetic ordering: diamagnetic
‣ Arsenic natural occurrence: primordial
‣ What is the oxidation state of arsenic?

Oxidation state: -3, 0, +3, +5
‣ What’s the electronegativity of arsenic?

Electronegativity: Pauling scale: 2.18
‣ Arsenic heat of fusion: grey: 24.44 kJ/mol
‣ Arsenic heat of vaporization: 34.76 kJ/mol
‣ Arsenic molar heat capacity: 24.64 J/(mol K)
‣ Arsenic molar magnetic susceptibility: -5.5 × 10-6 cm3/mol
‣ Arsenic crystal structure: rhombohedral
‣ Thermal expansion of arsenic: 5.6 µm/(m.K) (at r.t)
‣ Thermal conductivity of arsenic: 50.2 W/(m.K)
‣ Arsenic electrical resistivity: 333 nΩ.m (at 20 °C)
‣ What is the hardness of arsenic?

Mohs hardness: 3.5
Brinell hardness: 1440 MPa
‣ Young’s modulus of arsenic: 8 GPa
‣ Bulk modulus of arsenic: 22 GPa
‣ Arsenic CAS number: 7440-38-2

‣ Arsenic vapor pressure

Vapor pressure
P (Pa)1101001 k10 k100 k
at T (K)553596646706781874

‣ How many isotopes does arsenic have?

Main isotopes of arsenic
IsotopeAbundanceHalf-life (t1/2)Decay modeProduct
73Assyn80.3 dε
γ		73Ge
–
74Assyn17.8 dε
β+
γ
β–		74Ge
74Ge
–
74Se
75As100 %stable

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