Iodine Element (Periodic Table)

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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 yβ–129Xe
131Isyn8.02070 dβ–, γ131Xe
135Isyn6.57 hβ–135Xe

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