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: CH < sub > 2 </ sub >= CH < sub > 2 </ sub > + Br < sub > 2 </ sub > → BrCH < sub > 2 </ sub >- CH < sub > 2 </ sub > Br
: RC ≡ CR ' + 2 Br < sub > 2 </ sub > → RCBr < sub > 2 </ sub > CRBr < sub > 2 </ sub >
As a pharmaceutical, simple bromide ion, Br < sup >–</ sup >, has inhibitory effects on the central nervous system, and bromide salts were once a major medical sedative, before being replaced by shorter-acting drugs.
Elemental bromine exists as a diatomic molecule, Br < sub > 2 </ sub >.
: Br < sub > 2 </ sub > 2 Br ·
Bromine has two stable isotopes, < sup > 79 </ sup > Br ( 50. 69 %) and < sup > 81 </ sup > Br ( 49. 31 %).
The longest half-life is the neutron deficient < sup > 77 </ sup > Br at 2. 376 days.
The longest half-life on the neutron rich side is < sup > 82 </ sup > Br at 1. 471 days.
Stable < sup > 79 </ sup > Br exhibits a radioactive isomer, with a half-life of 4. 86 seconds.
The most abundant one is methyl bromide ( CH < sub > 3 </ sub > Br ) with an estimated 56, 000 tonnes produced by marine algae each year.
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New Letters from Charles Brown to Joseph Severn ( College Park, Maryland: Romantic Circles, 2007 ; revised 2010 ) < http :// www. rc. umd. edu / editions / brownsevern />
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Association theory is a discredited theory which tried to explain molecular structures of macromolecules .< Br /> Some other theories related to polymers include
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