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Compare Fluorine vs Bromine

Comparing Fluorine (F) and Bromine (Br). Atomic numbers 9 and 35 with atomic masses 18.998 u and 79.901 u, classified as nonmetal and nonmetal. Below: a side-by-side comparison of their physical, atomic, electron-configuration and historical properties, including density, melting and boiling points, ionization energies, oxidation states and discovery history.

vs
F
Fluorine
#9
Br
Bromine
#35

Periodic properties of the elements

FluorineBromine
SymbolFBr
Atomic number935
Group1717
Period24
Blockpp
Element categoryNonmetalNonmetal

Physical properties

FluorineBromine
Phase at STPGasLiquid
Density1.696 g/cm33.1028 g/cm3
Atomic weight18.9984 u79.901 u
Melting point53.48 K
-219.67 °C
-363.406 °F		265.8 K
-7.35 °C
18.77 °F
Boiling point85.03 K
-188.12 °C
-306.616 °F		332 K
58.85 °C
137.93 °F

Atomic properties

FluorineBromine
Electronegativity (Pauling Scale)3.982.96
Electron affinity328.165 kJ/mol324.537 kJ/mol
Oxidation states−1, 0
(oxidizes oxygen)		−1, +1, +3, +4, +5, +7
(a strongly acidic oxide)
Ionization energies
  1. 1681 kJ/mol
  2. 3374.2 kJ/mol
  3. 6050.4 kJ/mol
  4. 8407.7 kJ/mol
  5. 11022.7 kJ/mol
  6. 15164.1 kJ/mol
  7. 17868 kJ/mol
  8. 92038.1 kJ/mol
  9. 106434.3 kJ/mol
  1. 1139.9 kJ/mol
  2. 2103 kJ/mol
  3. 3470 kJ/mol
  4. 4560 kJ/mol
  5. 5760 kJ/mol
  6. 8550 kJ/mol
  7. 9940 kJ/mol
  8. 18600 kJ/mol

Electron configuration

FluorineBromine
Shorthand configuration[He] 2s2 2p5 [Ar] 3d10 4s2 4p5
Full configuration1s2 2s2 2p5 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p5
Electrons per shell2, 72, 8, 18, 7

History

FluorineBromine
DiscoveryAndré-Marie Ampère (1810)Antoine Jérôme Balard, Carl Jacob Löwig (1825)
First isolationHenri Moissan (1886)Antoine Jérôme Balard, Carl Jacob Löwig (1825)
Named byHumphry Davy, André-Marie Ampère
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