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Element 35 - Bromine (Br) sound

From bromos, or stench; discovered 1826; a red, caustic, fuming liquid with a foul smell. Bromine is an effective disinfectant. Among its compounds are the bromides, used in nerve sedatives and in petrol anti-knock compounds that make car engines run smoothly.

Properties

Atomic Number: 35
Atomic Weight: 79.904
Electron Configuration (at ground state): 1s22s22p63s23p63d104s24p5
Oxidation States (Bold most stable): -1, +1, +5, +7
Boiling Point (K): 331.85
Melting Point (K): 265.95
Density (at 300K -- g/cm3): 3.12
Atomic Volume (at 300K -- cm3/mol) 23.5
Number of stable isotopes: 2
Mass Number (Bold naturally occurring) -- Half-Life -- Disintigration Type: 82 -- 35.34 hours -- beta particle (electron) emission
Covalent Radius (Å): 1.14
Atomic Radius (Å): 1.12
First Ionization Potential (V): 11.814
Electronegativity (Pauling's): 2.96
Specific Heat Capacity (at 300K -- J g-1 K-1): 0.226
Heat of Vaporization (kJ/mol): 14.725
Heat of Fusion (kJ/mol): 5.286
Electrical Conductivity (at 293K for polycrystalline material -- 106 (ohms)-1 cm-1): 10-16
Thermal Conductivity (at 300K -- W m-1 K-1): 0.122
Crystal Structure: Orthorhombic
Acid-Base Properties: Very acidic