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Periodic Table Element Comparison: Compare Elements - Helium vs Argon

Compare Helium and Argon

Compare Helium and Argon on the basis of their properties, attributes and periodic table facts. Compare elements on more than 90 properties. All the elements of similar categories show a lot of similarities and differences in their chemical, atomic, physical properties and uses. These similarities and dissimilarities should be known while we study periodic table elements. You can study the detailed comparison between Helium vs Argon with most reliable information about their properties, attributes, facts, uses etc. You can compare He vs Ar on more than 90 properties like electronegativity , oxidation state, atomic shells, orbital structure, Electronaffinity, physical states, electrical conductivity and many more.

Facts

Helium
2
He
4.002602
Gas
Colorless
noble gas
18
helium family or neon family 
1
p
1s2
N/A
-268.93 °C
2
CAS7440-59-7
Neighborhood Elements of Helium
Argon
18
Ar
39.948
Gas
Colorless
noble gas
18
helium family or neon family 
3
p
[Ne] 3s2 3p6
-189.3 °C
-185.8 °C
2, 8, 8
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Neighborhood Elements of Argon

History

History
The element Helium was discovered by Pierre Janssen in year 1895 in Sweden and United Kingdom. Helium derived its name from from the Greek word helios, meaning 'sun'
The element Argon was discovered by Lord Rayleigh in year 1894 in United Kingdom. Argon derived its name derived its name from from the Greek word argos, meaning 'idle'

Presence: Abundance in Nature and Around Us

Ppb by weight (1ppb =10^-7 %)
0.23
0.23
N/A
5.5×10-7%
7.2×10-10%
N/A
0.0002
7e-05
N/A
1.5e-06
4.5e-07
N/A

Crystal Structure and Atomic Structure

31 pm
22.423540616247 cm3
32 pm
140 pm
0.007
helium Spectrum
424.2, 424.2, 424.2 pm
π/2, π/2, π/2
Fm_ 3m
225

Face Centered Cubic

helium Crystal Structure
71 pm
22.392376681614 cm3
97 pm
188 pm
0.65
argon Spectrum
525.6, 525.6, 525.6 pm
π/2, π/2, π/2
Fm_ 3m
225

Face Centered Cubic

argon Crystal Structure

Atomic and Orbital Properties

Atomic Number
Number of Electrons (with no charge)
Number of Protons
Mass Number
Number of Neutrons
Shell structure (Electrons per energy level)
Electron Configuration
Valence Electrons
Oxidation State
Atomic Term Symbol (Quantum Numbers)
Shell structure
2
2
2
4.002602
2.002602
2
1s2
1s2
 
1S0
helium Shells
18
18
18
39.948
21.948
2, 8, 8
[Ne] 3s2 3p6
3s2 3p6
 
1S0
argon Shells

Isotopes - Nuclear Properties

Isotopes
Naturally occurring stable isotopes:
3He, 4He.
Naturally occurring stable isotopes:
36Ar, 38Ar, 40Ar.

Chemical Properties: Ionization Energies and electron affinity

0
N/A
0 kJ/mol
2372.3, 5250.5 kJ/mol
0
N/A
0 kJ/mol
1520.6, 2665.8, 3931, 5771, 7238, 8781, 11995, 13842, 40760, 46186 kJ/mol

Physical Properties

0.1785 g/l
22.423540616247

 

N/A
N/A
N/A
N/A


 

N/A
N/A
N/A

 

N/A
N/A
N/A

 

0.1513 W/(m K)
N/A

 

Diamagnetic
N/A
-5.9×10-9
-2.36×10-11
-1.05×10-9

 

1.000035

 

970 m/s
1.784 g/l
22.392376681614

 

N/A
N/A
N/A
N/A


 

N/A
N/A
N/A

 

N/A
N/A
N/A

 

0.01772 W/(m K)
N/A

 

Diamagnetic
N/A
-6×10-9
-2.4×10-10
-1.07×10-8

 

1.000281

 

319 m/s

Thermal Properties - Enthalpies and thermodynamics

N/A
-268.93 °C
5.19 K
N/A

 

0.02 kJ/mol
0.083 kJ/mol
N/A
-189.3 °C
-185.8 °C
150.87 K
N/A

 

1.18 kJ/mol
6.5 kJ/mol
N/A

Regulatory and Health - Health and Safety Parameters and Guidelines

CAS7440-59-7
RTECSMH6520000
2.2
1963
N/A
0
N/A
1
0

 

N/A
N/A
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RTECSCF2300000
2.2
1951
N/A
N/A
N/A
N/A
N/A

 

N/A
N/A