Chlorine Element (Periodic Table)

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Chlorine

Chlorine (Cl) is a chemical element of the periodic table, located in the group 17 and the period 3, and is having the atomic number 17. It is a pale, greenish-yellow gas, whose name comes from the Greek word “chloros”, which means greenish yellow. It is a reactive nonmetal and is the 19th most abundant element on earth. It is the second lightest halogen, after the fluorine element.

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 Chlorine Element

Chlorine
‣ What does chlorine look like?

Appearance: pale yellow-green gas
‣ When was chlorine discovered and by whom?

Discovery and first isolation: Carl Wilhelm Scheele (1774)
Recognized as an element by: Humphry Davy (1808)
‣ Where is chlorine located on the periodic table?

Chlorine Periodic Table

Location: Chlorine is found in the third row of the periodic table, next to the sulfur element.
‣ What is chlorine atomic number?

Atomic number (Z): 17
‣ What is chlorine symbol?

Symbol: Cl
‣ What is the atomic weight of chlorine?

Standard atomic weight: [35.446, 35.457] conventional: 35.45
‣ Chlorine belongs to which block?

Block: p-block
‣ What group does chlorine belong to?

Group: 17 (halogens)
‣ What period is chlorine in on the periodic table?

Period: 3
‣ What is the covalent radius of chlorine?

Covalent radius: 102±4 pm
‣ Chlorine Van der Waals radius: 175 pm
‣ What is chlorine’s melting point?

Melting point: (Cl2) 171.6 K (-101.5 °C, -150.7 °F)
‣ What is the boiling point of chlorine?

Boiling point: (Cl2) 239.11 K (-34.04 °C, -29.27 °F)
‣ Chlorine critical point: 416.9 K, 7.991 MPa
‣ How many electron shells does chlorine have?

Electrons per shell: 2, 8, 7
‣ What is the electron configuration of chlorine (cl)?

Electron configuration: [Ne] 3s2 3p5
‣ What is chlorine ionization energy?

Ionization energies:
1st: 1251.2 kJ/mol
2nd: 2298 kJ/mol
3rd: 3822 kJ/mol
‣ What phase is chlorine normally found in?

Phase (at r.t): gas
‣ What is chlorine’s density?

Density (at STP): 3.2 g/L
when liquid (at b.p): 1.5625 g/cm3
‣ Chlorine magnetic ordering: diamagnetic
‣ Chlorine natural occurrence: primordial
‣ What is chlorine oxidation state?

Oxidation state: -1
‣ What is the chlorine electronegativity?

Electronegativity: Pauling scale: 3.16
‣ Chlorine heat of fusion: (Cl2) 6.406 kJ/mol
‣ Chlorine heat of vaporization: (Cl2) 20.41 kJ/mol
‣ Chlorine molar heat capacity: (Cl2) 33.949 J/(mol K)
‣ Chlorine molar magnetic susceptibility: -40.5 × 10-6 cm3/mol
‣ Speed of sound in chlorine: 206 m/s (gas, at 0 °C)
‣ What is the crystal structure of chlorine?

Crystal structure: orthorhombic
‣ Thermal conductivity of chlorine: 8.9 × 10-3 W/(m.K)
‣ Chlorine electrical resistivity: >10 Ω.m (at 20 °C)
‣ Chlorine CAS number: Cl2: 7782-50-5

‣ Chlorine vapor pressure

Vapor pressure
P (Pa)1101001 k10 k100 k
at T (K)128139153170197239

‣ How many isotopes does chlorine have?

Main isotopes of chlorine
IsotopeAbundanceHalf-life (t1/2)Decay modeProduct
35Cl76 %stable
36Cltrace3.01 × 105 yβ–
ε		36Ar
36S
37Cl24 %stable

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