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Periodic Table Element Comparison: Compare Elements - Helium vs Thallium

Compare Helium and Thallium

Compare Helium and Thallium 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 Thallium with most reliable information about their properties, attributes, facts, uses etc. You can compare He vs Tl 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
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Neighborhood Elements of Helium
Thallium
81
Tl
204.3833
Solid
Silver
post-transition metal
13
boron family 
6
p
[Xe] 4f14 5d10 6s2 6p1
304 °C
1473 °C
2, 8, 18, 32, 18, 3
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Neighborhood Elements of Thallium

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 Thallium was discovered by William Crookes in year 1861 in United Kingdom. Thallium derived its name derived its name from from the Greek thallos, 'green twig'

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
5×10-8%
1×10-7%
7.8×10-6%
5.3e-07
1×10-10%
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
156 pm
17.247535864979 cm3
148 pm
196 pm
3.4
thallium Spectrum
345.66, 345.66, 552.48 pm
π/2, π/2, 2 π/3
P63/mmc
194

Simple Hexagonal

thallium 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
81
81
81
204.3833
123.3833
2, 8, 18, 32, 18, 3
[Xe] 4f14 5d10 6s2 6p1
6s2 6p1
-5;-2;-1  1;2;3
2P1/2
thallium Shells

Isotopes - Nuclear Properties

Isotopes
Naturally occurring stable isotopes:
3He, 4He.
Naturally occurring stable isotopes:
203Tl, 205Tl.

Chemical Properties: Ionization Energies and electron affinity

0
N/A
0 kJ/mol
2372.3, 5250.5 kJ/mol
3
1.62
19.2 kJ/mol
589.4, 1971, 2878 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
11.85 g/cm3
17.247535864979

 

8 GPa
2.8 GPa
43 GPa
0.45


 

1.2 MPa
N/A
26.4 MPa

 

6.7×106 S/m
1.5×10-7 m Ω
2.38

 

46 W/(m K)
0.0000299 K-1

 

Diamagnetic
N/A
-3×10-9
-6.13×10-10
-3.56e-05

 

N/A

 

818 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
304 °C
1473 °C
N/A
2.38

 

4.2 kJ/mol
165 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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RTECSXG3425000
N/A
1707
N/A
N/A
N/A
N/A
N/A

 

N/A
N/A