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Periodic Table Element Comparison: Compare Elements - Selenium vs Oxygen

Compare Selenium and Oxygen

Compare Selenium and Oxygen 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 Oxygen with most reliable information about their properties, attributes, facts, uses etc. You can compare Se vs O 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
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

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 Oxygen was discovered by Carl Wilhelm Scheele in year 1774 in Sweden and United Kingdom. Oxygen derived its name derived its name from from the Greek word oxy-, both 'sharp' and 'acid', and -gen, meaning 'acid-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%
0.01
0.009
0.4
0.46
0.86
0.61

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
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

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

Isotopes - Nuclear Properties

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

Chemical Properties: Ionization Energies and electron affinity

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

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)
-218.3 °C
-182.9 °C
154.59 K
N/A

 

0.222 kJ/mol
3.41 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
CAS7782-44-7
RTECSRS2060000
2.2
1073
N/A
0
Oxidizing Agent
3
2

 

N/A
N/A