Chemical Data

atomic mass	79.904
atomic number	35
melting point	-7.2ºC
Boiling point	58.78°C
density	7.59 g/l(gas, 1 atm) 3.12 g/l(liquid, 20°C)
Oxidation States	+1, -1,+5
Electron Configuration	(Ar)3d^¹⁰4s^²4p^⁵

list of isotopes

All naturally occuring bromine is a mixture of bromine-79 and bromine-81. The rest of the isotopes are both man-made and radioactive.

Isotope	Natural abondance	Half-life	Decay Mode
⁷²Br		1.31 min	ß+
⁷³Br		3.4 min	ß+
⁷⁴Br		41.5 min	ß+
⁷⁴Br		25.3 min	ß+
⁷⁵Br		98 min	^{ß+, ec}
^76mBr		^{1.49 sec}	^i.t.
⁷⁶Br		16.1 hr	^{ß+, ec}
^77mBr		4.3 min
⁷⁷Br		57.0 hr	^{ß+, ec}
⁷⁸Br		6.46 min	^{ß+, ec}
^79mBr		4.86 sec	^i.t.
⁷⁹Br	50.69 %		^ß
^80mBr		4.42 hr	^i.t.
⁸⁰Br		17.6 min	^{ß+, ec}
⁸¹Br	49.31 %
^82mBr			^{ß-, i.t.}
⁸²Br		35.3 hr	^ß-
⁸³Br		2.39 hr	^ß-
^84mBr		6 min	^ß-
⁸⁴Br		31.8 min	^ß-
⁸⁵Br		2.87 min	^ß-
⁸⁶Br			^ß-
⁸⁷Br		51.6 sec	^ß-
⁸⁸Br		16.4 sec	^{ß-, n}
⁸⁹Br		4.4 sec	^{ß-, n}
⁹⁰Br		1.9 sec	^{ß-, n}
⁹¹Br		540 ms	^{ß-, n}
⁹²Br		360 ms	^{ß-, n}

Explanation of structure Number of Energy Levels: 4 wpe1.jpg (8499 bytes)

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