Electrons: 35. Number of Neutrons: 45.
Atomic Number: 35
Atomic Symbol: Br
Atomic Weight: 79.904Melting Point: -44.96 F (-7.2 C)
Boiling Point: 137.84 F (58.8 C)
Where it's found
It was used for important purposes long before it was formally discovered.
Two separate scientists isolated bromine, including one who was still in school.
Carl Lowig's school work prevented him from publishing his findings on bromine, leaving Balard to beat him to it.
Bromine does not occur naturally on Earth as an element.
Its salts are found in the crust at about .4 parts per million.
Bromine is only the 64th most common element on Earth.
It is more rare than three quarters of the elements that comprise the Earth's crust.
Bromine's easy solubility means it has built up in the oceans through leaching.
Most bromine produced is extracted from brine.
Typically, bromine is found as the diatomic Br2.
This Br2 is only found as bromide salts, never as pure bromine.
It is somewhat transparent, even though it is a dark, reddish color.
It evaporates easily under normal conditions.
Along with mercury, bromine is one of two elements found to be a liquid at room temperature.
Bromine reacts very strongly with most metals to produce bromide salts.
Bromine has two stable isotopes.
Br-79 makes up slightly more than 50% of all bromine found, and Br-81 makes up just over 49%.
There are 23 known radioactive isotopes of bromine.
The longest half-life of any known bromine radioisotope is 2.38 days.
Bromine was first used industrially to replace iodine vapor in the daguerreotype.
Two bromine compounds were used as sedatives and seizure medications in the 1800s and early 1900s.
Bromine was a component of World War I era poison gas.
Today, bromine plays a vital role in the production of flame retardant materials.
This brominated retardant is the current largest industrial use for bromine.
The US and Israel, typically extracted from the Dead Sea, are the world's two largest producers of bromine.