Bromine at Chemical Elements.com 

 

Basic Information


Name: Bromine
Symbol: Br
Atomic Number: 35
Atomic Mass: 79.904 amu
Melting Point: -7.2 °C (265.95 °K, 19.04 °F)
Boiling Point: 58.78 °C (331.93 °K, 137.804 °F)
Number of Protons/Electrons: 35
Number of Neutrons: 45
Classification: Halogen
Crystal Structure: Orthorhombic
Density @ 293 K: 3.119 g/cm3
Color: Red


Atomic Structure

[Bohr Model of Bromine]  
Number of Energy Levels: 4

    First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 18
    Fourth Energy Level: 7

Isotopes

Isotope Half Life
Br-76 16.0 hours
Br-77 2.4 days
Br-79 Stable
Br-80 17.7 minutes
Br-80m 4.42 hours
Br-81 Stable
Br-82 1.5 days
Br-83 2.4 hours
Br-84 31.8 minutes
Br-85 2.9 minutes

Facts


Date of Discovery: 1826
Discoverer: Antoine J. Balard
Name Origin: From the Greek word brômos (stench)
Uses: Poisonous
Obtained From: Sea Water

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