Argon Element (Periodic Table)

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Argon

Argon (Ar) is a chemical element of the periodic table, located in the group 18 and the period 3, and is having the atomic number 18. It is a colorless, odorless, tasteless gas, whose name comes from the Greek word “argos”, which means lazy or inactive. It is a member of the noble gas 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 Argon Element

Argon
‣ What does argon look like?

Appearance: colorless gas exhibiting a lilac/violet glow when placed in an electric field
‣ When was argon discovered and who discovered it?

Discovery and first isolation: Lord Rayleigh and William Ramsay (1894)
‣ Where is argon located on the periodic table?

Argon Periodic Table

Location: Argon is found in the eighteenth column of the periodic table below the neon element.
‣ What is argon atomic number?

Atomic number (Z): 18
‣ What’s the chemical symbol for argon?

Symbol: Ar
‣ What is the atomic weight of argon?

Standard atomic weight: [39.792, 39.963] conventional: 39.95
‣ What block is argon in the periodic table?

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

Group: 18 (noble gases)
‣ What period is argon in on the periodic table?

Period: 3
‣ Argon covalent radius: 106±10 pm
‣ Argon Van der Waals radius: 188 pm
‣ What is the melting point of argon?

Melting point: 83.81 K (-189.34 °C, -308.81 °F)
‣ What is the boiling point of argon?

Boiling point: 87.302 K (-185.848 °C, -302.526 °F)
‣ Argon critical point: 150.687 K, 4.863 MPa
‣ Argon triple point: 83.8058 K, 68.89 kPa
‣ How many electron shells does argon have?

Electrons per shell: 2, 8, 8
‣ What is the ground state electron configuration of argon?

Electron configuration: [Ne] 3s2 3p6
‣ What is argon ionization energy?

Ionization energies:
1st: 1520.6 kJ/mol
2nd: 2665.8 kJ/mol
3rd: 3931 kJ/mol
‣ What phase is argon normally found in?

Phase (at r.t): gas
‣ What is the density of argon at STP?

Density (at STP): 1.784 g/L
when liquid (at b.p): 1.3954 g/cm3
‣ Argon magnetic ordering: diamagnetic
‣ Argon natural occurrence: primordial
‣ What is the oxidation state of argon?

Oxidation state: 0
‣ What is the electronegativity value of argon?

Electronegativity: Pauling scale: no data
‣ Argon heat of fusion: 1.18 kJ/mol
‣ Argon heat of vaporization: 6.53 kJ/mol
‣ Argon molar heat capacity: 20.85 J/(mol K)
‣ Argon molar magnetic susceptibility: -19.6 × 10-6 cm3/mol
‣ Speed of sound in argon: 323 m/s (gas, at 27 °C)
‣ Argon crystal structure: face-centered cubic (fcc)
‣ Thermal conductivity of argon: 17.72 × 10-3 W/(m.K)
‣ Argon CAS number: 7440-37-1

‣ Argon vapor pressure

Vapor pressure
P (Pa)1101001 k10 k100 k
at T (K)4753617187

‣ How many isotopes does argon have?

Main isotopes of argon
IsotopeAbundanceHalf-life (t1/2)Decay modeProduct
36Ar0.334 %stable
37Arsyn35 dε37Cl
38Ar0.063 %stable
39Artrace269 yβ–39K
40Ar99.604 %stable
41Arsyn109.34 minβ–41K
42Arsyn32.9 yβ–42K

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