Periodic Table Element Comparison: Compare Elements - Selenium vs Bromine
Compare Selenium and Bromine
Compare Selenium and Bromine 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 Bromine with most reliable information about their properties, attributes, facts, uses etc. You can compare Se vs Br on more than 90 properties like electronegativity , oxidation state, atomic shells, orbital structure, Electronaffinity, physical states, electrical conductivity and many more.
Facts
Name | Selenium | Bromine |
Atomic Number | 34 | 35 |
Atomic Symbol | Se | Br |
Atomic Weight | 78.96 | 79.904 |
Phase at STP | Solid | Liquid |
Color | Gray | Red |
Metallic Classification | Other Nonmetal | Halogens |
Group in Periodic Table | group 16 | group 17 |
Group Name | oxygen family | fluorine family |
Period in Periodic Table | period 4 | period 4 |
Block in Periodic Table | p -block | p -block |
Electronic Configuration | [Ar] 3d10 4s2 4p4 | [Ar] 3d10 4s2 4p5 |
Electronic Shell Structure (Electrons per shell) | 2, 8, 18, 6 | 2, 8, 18, 7 |
Melting Point | 494 K | 265.8 K |
Boiling Point | 958 K | 332 K |
CAS Number | CAS7782-49-2 | CAS7726-95-6 |
Neighborhood Elements | Neighborhood Elements of Selenium | Neighborhood Elements of Bromine |
History
History | The element Selenium was discovered by J. Berzelius and G. Gahn in year 1817 in Sweden. Selenium derived its name from the Greek selene, meaning 'moon'. | The element Bromine was discovered by J. Balard and C. Löwig in year 1825 in France. Bromine derived its name from the Greek bromos, meaning 'stench'. |
Discovery | J. Berzelius and G. Gahn (1817) | J. Balard and C. Löwig (1825) |
Isolated | J. Berzelius and G. Gahn (1817) | J. Balard and C. Löwig (1825) |
Presence: Abundance in Nature and Around Us
Parts per billion (ppb) by weight / by atoms (1ppb =10^-7 %)
Abundance in Universe | 30 / 0.5 | 7 / 0.1 |
Abundance in Sun | - / - | - / - |
Abundance in Meteorites | 13000 / 2900 | 1200 / 230 |
Abundance in Earth's Crust | 50 / 10 | 3000 / 780 |
Abundance in Oceans | 0.45 / 0.035 | 67300 / 5210 |
Abundance in Humans | 50 / 4 | 2900 / 230 |
Crystal Structure and Atomic Structure
Atomic Volume | 16.385 cm3/mol | 19.78 cm3/mol |
Atomic Radius | 103 pm | 94 pm |
Covalent Radius | 116 pm | 114 pm |
Van der Waals Radius | 190 pm | 185 pm |
Atomic Spectrum | ![]() | ![]() |
Lattice Constant | 905.4, 908.3, 1160.1 pm | 672.65, 464.51, 870.23 pm |
Lattice Angle | π/2, 1.58493, π/2 | π/2, π/2, π/2 |
Space Group Name | P121/c1 | Cmca |
Space Group Number | 14 | 64 |
Crystal Structure | Simple Monoclinic ![]() | Base Centered Orthorhombic ![]() |
Atomic and Orbital Properties
Atomic Number | 34 | 35 |
Number of Electrons (with no charge) | 34 | 35 |
Number of Protons | 34 | 35 |
Mass Number | 78.96 | 79.904 |
Number of Neutrons | 45 | 45 |
Shell structure (Electrons per energy level) | 2, 8, 18, 6 | 2, 8, 18, 7 |
Electron Configuration | [Ar] 3d10 4s2 4p4 | [Ar] 3d10 4s2 4p5 |
Valence Electrons | 4s2 4p4 | 4s2 4p5 |
Oxidation State | -2, 2, 4, 6 | -1, 1, 3, 5 |
Atomic Term Symbol (Quantum Numbers) | 3P2 | 2P3/2 |
Shell structure | ![]() | ![]() |
Isotopes and Nuclear Properties
Selenium has 5 stable naturally occuring isotopes while Bromine has 2 stable naturally occuring isotopes.
Known Isotopes | 65Se, 66Se, 67Se, 68Se, 69Se, 70Se, 71Se, 72Se, 73Se, 74Se, 75Se, 76Se, 77Se, 78Se, 79Se, 80Se, 81Se, 82Se, 83Se, 84Se, 85Se, 86Se, 87Se, 88Se, 89Se, 90Se, 91Se, 92Se, 93Se, 94Se | 67Br, 68Br, 69Br, 70Br, 71Br, 72Br, 73Br, 74Br, 75Br, 76Br, 77Br, 78Br, 79Br, 80Br, 81Br, 82Br, 83Br, 84Br, 85Br, 86Br, 87Br, 88Br, 89Br, 90Br, 91Br, 92Br, 93Br, 94Br, 95Br, 96Br, 97Br |
Stable Isotopes | Naturally occurring stable isotopes: 74Se, 76Se, 77Se, 78Se, 80Se | Naturally occurring stable isotopes: 79Br, 81Br |
Neutron Cross Section | 11.7 | 6.8 |
Neutron Mass Absorption | 0.0056 | 0.002 |
Chemical Properties: Ionization Energies and electron affinity
Valence or Valency | 6 | 5 |
Electronegativity | 2.55 Pauling Scale | 2.96 Pauling Scale |
Electron Affinity | 195 kJ/mol | 324.6 kJ/mol |
Ionization Energies | 1st: 941 kJ/mol 2nd: 2045 kJ/mol 3rd: 2973.7 kJ/mol 4th: 4144 kJ/mol 5th: 6590 kJ/mol 6th: 7880 kJ/mol 7th: 14990 kJ/mol | 1st: 1139.9 kJ/mol 2nd: 2103 kJ/mol 3rd: 3470 kJ/mol 4th: 4560 kJ/mol 5th: 5760 kJ/mol 6th: 8550 kJ/mol 7th: 9940 kJ/mol 8th: 18600 kJ/mol |
Physical Properties
Density | 4.819 g/cm3 | 3.12 g/cm3 |
Molar Volume | 16.385 cm3/mol | 19.78 cm3/mol |
Elastic Properties | ||
Young Modulus | 10 | - |
Shear Modulus | 3.7 GPa | - |
Bulk Modulus | 8.3 GPa | 1.9 GPa |
Poisson Ratio | 0.33 | - |
Hardness - Tests to Measure of Hardness of Element | ||
Mohs Hardness | 2 MPa | - |
Vickers Hardness | - | - |
Brinell Hardness | 736 MPa | - |
Electrical Properties | ||
Electrical Conductivity | - | 1e-10 S/m |
Resistivity | - | 10000000000 m Ω |
Superconducting Point | - | - |
Heat and Conduction Properties | ||
Thermal Conductivity | 0.52 W/(m K) | 0.12 W/(m K) |
Thermal Expansion | - | - |
Magnetic Properties | ||
Magnetic Type | Diamagnetic | Diamagnetic |
Curie Point | - | - |
Mass Magnetic Susceptibility | -4e-9 m3/kg | -4.9e-9 m3/kg |
Molar Magnetic Susceptibility | -3.16e-10 m3/mol | -7.83e-10 m3/mol |
Volume Magnetic Susceptibility | -0.0000193 | -0.0000153 |
Optical Properties | ||
Refractive Index | 1.000895 | 1.001132 |
Acoustic Properties | ||
Speed of Sound | 3350 m/s | - |
Thermal Properties - Enthalpies and thermodynamics
Melting Point | 494 K | 265.8 K |
Boiling Point | 958 K | 332 K |
Critical Temperature | 1766 K | 588 K |
Superconducting Point | - | - |
Enthalpies | ||
Heat of Fusion | 5.4 kJ/mol | 5.8 kJ/mol |
Heat of Vaporization | 26 kJ/mol | 14.8 kJ/mol |
Heat of Combustion | - | - |
Regulatory and Health - Health and Safety Parameters and Guidelines
CAS Number | CAS7782-49-2 | CAS7726-95-6 |
RTECS Number | {N/A, RTECSVS7700000, N/A} | RTECSEF9100000 |
DOT Hazard Class | {N/A, 6.1, N/A} | 8 |
DOT Numbers | {N/A, 2658, N/A} | 1744 |
EU Number | - | - |
NFPA Fire Rating | {N/A, 0, N/A} | 0 |
NFPA Hazards | N/ A, N/ A, N/ A | Oxidizing Agent |
NFPA Health Rating | {N/A, 2, N/A} | 3 |
NFPA Reactivity Rating | {N/A, 0, N/A} | 0 |
AutoIgnition Point | - | - |
Flashpoint | - | -18 °C |
Compare With Other Elements
Compare Selenium with all Group 16 elementsSelenium vs LivermoriumSelenium vs TelluriumSelenium vs OxygenSelenium vs SulfurSelenium vs Polonium Compare Selenium with all Period 4 elementsSelenium vs GermaniumSelenium vs NickelSelenium vs BromineSelenium vs ScandiumSelenium vs ArsenicSelenium vs CobaltSelenium vs CalciumSelenium vs ChromiumSelenium vs KryptonSelenium vs VanadiumSelenium vs ZincSelenium vs PotassiumSelenium vs TitaniumSelenium vs ManganeseSelenium vs IronSelenium vs CopperSelenium vs Gallium Compare Selenium with all Other Nonmetal elements | Compare Bromine with all Group 17 elementsCompare Bromine with all Period 4 elementsBromine vs GermaniumBromine vs NickelBromine vs ScandiumBromine vs ArsenicBromine vs CobaltBromine vs CalciumBromine vs ChromiumBromine vs SeleniumBromine vs KryptonBromine vs VanadiumBromine vs ZincBromine vs PotassiumBromine vs TitaniumBromine vs ManganeseBromine vs IronBromine vs CopperBromine vs Gallium Compare Bromine with all Halogens elements |