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Periodic Table Element Comparison: Compare Elements - Oxygen vs Selenium

Compare Oxygen and Selenium

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

Facts

Oxygen
8
O
15.9994
Gas
Colorless
other nonmetal
16
oxygen family 
2
p
[He] 2s2 2p4
-218.3 °C
-182.9 °C
2, 6
CAS7782-44-7
Neighborhood Elements of Oxygen
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

History

History
The element Oxygen was discovered by Carl Wilhelm Scheele in year 1774 in Sweden and United Kingdom. Oxygen derived its name from from the Greek word oxy-, both 'sharp' and 'acid', and -gen, meaning 'acid-forming'
The element Selenium was discovered by Jöns Jakob Berzelius in year 1817 in Sweden. Selenium derived its name derived its name from from the Greek selene, meaning 'moon'

Presence: Abundance in Nature and Around Us

Ppb by weight (1ppb =10^-7 %)
0.01
0.009
0.4
0.46
0.86
0.61
3×10-6%
N/A
1.3e-05
5×10-6%
4.5×10-8%
5×10-6%

Crystal Structure and Atomic Structure

48 pm
11.19622113366 cm3
73 pm
152 pm
0.00028
oxygen Spectrum
540.3, 342.9, 508.6 pm
π/2, 2.313085, π/2
C12/m1
12

Base Centered Monoclinic

oxygen Crystal 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

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
8
8
8
15.9994
7.9994
2, 6
[He] 2s2 2p4
2s2 2p4
-2;-1  1;2
3P2
oxygen Shells
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

Isotopes - Nuclear Properties

Isotopes
Naturally occurring stable isotopes:
16O, 17O, 18O.
Naturally occurring stable isotopes:
74Se, 76Se, 77Se, 78Se, 80Se.

Chemical Properties: Ionization Energies and electron affinity

2
3.44
141 kJ/mol
1313.9, 3388.3, 5300.5, 7469.2, 10989.5, 13326.5, 71330, 84078 kJ/mol
6
2.55
195 kJ/mol
941, 2045, 2973.7, 4144, 6590, 7880, 14990 kJ/mol

Physical Properties

1.429 g/l
11.19622113366

 

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


 

N/A
N/A
N/A

 

N/A
N/A
N/A

 

0.02658 W/(m K)
N/A

 

Paramagnetic
N/A
1.335×10-6
4.27184×10-8
1.90772×10-6

 

1.000271

 

317.5 m/s
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

Thermal Properties - Enthalpies and thermodynamics

-218.3 °C
-182.9 °C
154.59 K
N/A

 

0.222 kJ/mol
3.41 kJ/mol
N/A
221 °C
685 °C
1766 K
N/A

 

5.4 kJ/mol
26 kJ/mol
{"N/A", "N/A", "N/A"} J/(kg K)

Regulatory and Health - Health and Safety Parameters and Guidelines

CAS7782-44-7
RTECSRS2060000
2.2
1073
N/A
0
Oxidizing Agent
3
2

 

N/A
N/A
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