The Nuttall Encyclopedia
name given to the elementary bodies, chlorine, bromine, iodine, and fluorine as in composition with metals forming compounds similar to sea-salt.
U.S. National Library of Medicine
A family of nonmetallic, generally electronegative, elements that form group 17 (formerly group VIIa) of the periodic table.
The numerical value of halogens in Chaldean Numerology is: 5
The numerical value of halogens in Pythagorean Numerology is: 9
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