Periodic Table Element Comparison: Compare Elements - Polonium vs Selenium
Compare Polonium and Selenium
Compare Polonium 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 Polonium vs Selenium with most reliable information about their properties, attributes, facts, uses etc. You can compare Po vs Se on more than 90 properties like electronegativity , oxidation state, atomic shells, orbital structure, Electronaffinity, physical states, electrical conductivity and many more.
Facts
Name |
Atomic Number |
Atomic Symbol |
Atomic Weight |
Phase |
Color |
Classification |
Group in Periodic Table |
Group Name |
Period in Periodic Table |
Block in Periodic Table |
Electronic Configuration |
Melting Point |
Boiling Point |
Electronic Shell Structure |
CAS Number |
Neighborhood Elements |
Polonium |
84 |
Po |
209 |
Solid |
Silver |
metalloid |
16 |
oxygen family |
6 |
p |
[Xe] 4f14 5d10 6s2 6p4 |
254 °C |
962 °C |
2, 8, 18, 32, 18, 6 |
CAS7440-08-6 |
Neighborhood Elements of Polonium |
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 Polonium was discovered by Pierre Curie in year 1898 in France. Polonium derived its name from from Named after the home country of Marie Curie(Poland), who is also the discoverer of Radium |
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
N/A |
N/A |
N/A |
N/A |
2×10-18% |
None |
3×10-6% |
N/A |
1.3e-05 |
5×10-6% |
4.5×10-8% |
5×10-6% |
Crystal Structure and Atomic Structure
Atomic Radius |
Atomic Volume |
Covalent Radius |
Van der Waals Radius |
Neutron Cross Section |
Atomic Spectrum |
Lattice Constant |
Lattice Angle |
Space Group Name |
Space Group Number |
Crystal Structure |
135 pm |
22.727272727273 cm3 |
N/A |
N/A |
0.5 |
![]() |
335.9, 335.9, 335.9 pm |
π/2, π/2, π/2 |
Pm-3m |
221 |
Simple Cubic ![]() |
103 pm |
16.385142145673 cm3 |
116 pm |
190 pm |
11.7 |
![]() |
905.4, 908.3, 1160.1 pm |
π/2, 1.58493, π/2 |
P121/c1 |
14 |
Simple Monoclinic ![]() |
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 |
84 |
84 |
84 |
209 |
125 |
2, 8, 18, 32, 18, 6 |
[Xe] 4f14 5d10 6s2 6p4 |
6s2 6p4 |
-2 2;4;5;6 |
3P2 |
![]() |
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 |
![]() |
Isotopes - Nuclear Properties
Isotopes |
Naturally occurring stable
isotopes: None. |
Naturally occurring stable
isotopes: 74Se, 76Se, 77Se, 78Se, 80Se. |
Chemical Properties: Ionization Energies and electron affinity
6 |
2 |
183.3 kJ/mol |
812.1 kJ/mol |
6 |
2.55 |
195 kJ/mol |
941, 2045, 2973.7, 4144, 6590, 7880, 14990 kJ/mol |
Physical Properties
Density |
Molar Volume |
Elastic Properties |
Young Modulus |
Shear Modulus |
Bulk Modulus |
Poisson Ratio |
Hardness - Tests to Measure of Hardness of Element |
Mohs Hardness |
Vickers Hardness |
Brinell Hardness |
Electrical Properties |
Electrical Conductivity |
Resistivity |
Superconducting Point |
Heat and Conduction Properties |
Thermal Conductivity |
Thermal Expansion |
Magnetic Properties |
Magnetic Type |
Curie Point |
Mass Magnetic Susceptibility |
Molar Magnetic Susceptibility |
Volume Magnetic Susceptibility |
Optical Properties |
Refractive Index |
Acoustic Properties |
Speed of Sound |
9.196 g/cm3 |
22.727272727273 |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
2.3×106 S/m |
4.3×10-7 m Ω |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
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
254 °C |
962 °C |
N/A |
N/A |
13 kJ/mol |
100 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
CAS Number |
RTECS Number |
DOT Hazard Class |
DOT Numbers |
EU Number |
NFPA Fire Rating |
NFPA Hazards |
NFPA Health Rating |
NFPA Reactivity Rating |
More |
AutoIgnition Point |
Flashpoint |
CAS7440-08-6 |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
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 |