Iodine Element (Periodic Table)

Iodine

Iodine (I) is a chemical element of the periodic table, located in the group 17 and the period 5, and has the atomic number 53. It is a lustrous, black reactive nonmetal, whose name comes from the Greek word “iodes”, which means violet. It is counted as one of the heaviest elements in the halogen 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 Iodine Element

Iodine
‣ What does iodine look like?

Appearance: lustrous metallic grey solid, black/violet liquid, violet gas
‣ When was iodine first discovered and by whom?

Discovery and first isolation: Bernard Courtois (1811)
‣ Where is iodine located on the periodic table?

Iodine Periodic Table

Location: Iodine is found in the fifth row of the periodic table below the bromine element.
‣ What is iodine atomic number?

Atomic number (Z): 53
‣ What is the chemical symbol for iodine?

Symbol: I
‣ What is the atomic weight of iodine?

Standard atomic weight: 126.90447
‣ What block is iodine in the periodic table?

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

Group: 17 (halogens)
‣ Which period is iodine in on the periodic table?

Period: 5
‣ What is the atomic radius of iodine?

Atomic radius: empirical: 140 pm
Iodine covalent radius: 139±3 pm
Iodine Van der Waals radius: 198 pm
‣ What is iodine melting point?

Melting point: (I2) 386.85 K (113.7 °C, 236.66 °F)
‣ What is the boiling point of iodine?

Boiling point: (I2) 457.4 K (184.3 °C, 363.7 °F)
Iodine critical point: 819 K, 11.7 MPa
Iodine triple point: 386.65 K, 12.1 MPa
‣ How many electron shells does iodine have?

Electrons per shell: 2, 8, 18, 18, 7
‣ What is the condensed electron configuration of iodine?

Electron configuration: [Kr] 4d10 5s2 5p5
‣ What is iodine ionization energy?

Ionization energies:
1st: 1008.4 kJ/mol
2nd: 1845.9 kJ/mol
3rd: 3180 kJ/mol
‣ What phase is iodine at room temperature?

Phase (at r.t): solid
‣ What is the density of iodine?

Density (near r.t): 4.933 g/cm3
Iodine magnetic ordering: diamagnetic
Iodine natural occurrence: primordial
‣ What is the iodine oxidation state?

Oxidation state: +5
‣ What is the electronegativity of iodine?

Electronegativity: Pauling scale: 2.66
Iodine heat of fusion: (I2) 15.52 kJ/mol
Iodine heat of vaporization: (I2) 41.57 kJ/mol
Iodine molar heat capacity: (I2) 54.44 J/(mol K)
Iodine molar magnetic susceptibility: -88.7 × 10-6 cm3/mol (298 K)
‣ What type of structure does iodine have?

Crystal structure: orthorhombic
Thermal conductivity of iodine: 0.449 W/(m.K)
Iodine electrical resistivity: 1.3 × 107 Ω.m (at 0 °C)
Bulk modulus of iodine: 7.7 GPa
Iodine CAS number: 7553-56-2

‣ Iodine vapor pressure

Vapor pressure (rhombic)
P (Pa)1101001 k10 k100 k
at T (K)260282309342381457

‣ How many isotopes does iodine have?

Main isotopes of iodine
IsotopeAbundanceHalf-life (t1/2)Decay modeProduct
123Isyn13 hε, γ123Te
124Isyn4.176 dε124Te
125Isyn59.40 dε125Te
127I100 %stable
129Itrace1.57 × 107 yβ129Xe
131Isyn8.02070 dβ, γ131Xe
135Isyn6.57 hβ135Xe

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