Argon Element (Periodic Table)

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 yβ39K
40Ar99.604 %stable
41Arsyn109.34 minβ41K
42Arsyn32.9 yβ42K

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