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Periodic Table Element Comparison: Compare Elements - Selenium vs Hydrogen

Compare Selenium and Hydrogen

Compare Selenium and Hydrogen 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 Selenium vs Hydrogen with most reliable information about their properties, attributes, facts, uses etc. You can compare Se vs H on more than 90 properties like electronegativity , oxidation state, atomic shells, orbital structure, Electronaffinity, physical states, electrical conductivity and many more.

Facts

Selenium
34
Se
78.96
Solid
Gray
other nonmetal
16
oxygen family 
4
p
[Ar] 3d10 4s2 4p4
221 °C
685 °C
2, 8, 18, 6
CAS7782-49-2
Neighborhood Elements of Selenium
Hydrogen
1
H
1.00794
Gas
Colorless
other nonmetal
1
lithium family 
1
s
1s1
-259.14 °C
-252.87 °C
1
CAS1333-74-0
Neighborhood Elements of Hydrogen

History

History
The element Selenium was discovered by Jöns Jakob Berzelius in year 1817 in Sweden. Selenium derived its name from from the Greek selene, meaning 'moon'
The element Hydrogen was discovered by Henry Cavendish in year 1766 in United Kingdom. Hydrogen derived its name derived its name from from the Greek elements hydro- and -gen meaning 'water-forming'

Presence: Abundance in Nature and Around Us

Ppb by weight (1ppb =10^-7 %)
3×10-6%
N/A
1.3e-05
5×10-6%
4.5×10-8%
5×10-6%
0.75
0.75
0.024
0.0015
0.11
0.1

Crystal Structure and Atomic Structure

103 pm
16.385142145673 cm3
116 pm
190 pm
11.7
selenium Spectrum
905.4, 908.3, 1160.1 pm
π/2, 1.58493, π/2
P121/c1
14

Simple Monoclinic

selenium Crystal Structure
53 pm
11.211790878754 cm3
37 pm
120 pm
0.332
hydrogen Spectrum
470 pm, 470 pm, 340 pm
π/2, π/2, 2 π/3
P63/mmc
194

Simple Hexagonal

hydrogen 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
34
34
34
78.96
44.96
2, 8, 18, 6
[Ar] 3d10 4s2 4p4
4s2 4p4
-2;-1  1;2;3;4;5;6
3P2
selenium Shells
1
1
1
1.00794
0.0079400000000001
1
1s1
1s1
-1  1
2S1/2
hydrogen Shells

Isotopes - Nuclear Properties

Isotopes
Naturally occurring stable isotopes:
74Se, 76Se, 77Se, 78Se, 80Se.
Naturally occurring stable isotopes:
1H, 2H.

Chemical Properties: Ionization Energies and electron affinity

6
2.55
195 kJ/mol
941, 2045, 2973.7, 4144, 6590, 7880, 14990 kJ/mol
1
2.2
72.8 kJ/mol
1312 kJ/mol

Physical Properties

4.819 g/cm3
16.385142145673

 

10 GPa
3.7 GPa
8.3 GPa
0.33


 

2 MPa
N/A
736 MPa

 

N/A
N/A
N/A

 

0.52 W/(m K)
N/A

 

Diamagnetic
N/A
-4×10-9
-3.16×10-10
-1.93e-05

 

1.000895

 

3350 m/s
0.0899 g/l
11.211790878754

 

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


 

N/A
N/A
N/A

 

N/A
N/A
N/A

 

0.1805 W/(m K)
N/A

 

Diamagnetic
N/A
-2.48×10-8
-4.999×10-11
-2.23×10-9

 

1.000132

 

1270 m/s

Thermal Properties - Enthalpies and thermodynamics

221 °C
685 °C
1766 K
N/A

 

5.4 kJ/mol
26 kJ/mol
{"N/A", "N/A", "N/A"} J/(kg K)
-259.14 °C
-252.87 °C
32.97 K
N/A

 

0.558 kJ/mol
0.452 kJ/mol
N/A

Regulatory and Health - Health and Safety Parameters and Guidelines

CAS7782-49-2
{N/A, RTECSVS7700000, N/A}
{N/A, 6.1, N/A}
"N/A", {2658}, "N/A"
{N/A, N/A, N/A}
{N/A, 0, N/A}
N/ A, N/ A, N/ A
{N/A, 2, N/A}
{N/A, 0, N/A}

 

N/A
N/A
CAS1333-74-0
RTECSMW8900000
2.1
1966
N/A
4
N/A
3
0

 

535.5 °C
-18 °C