Arsenic Element (Periodic Table)

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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