7a Halogens

7a Halogens
Name	Symbol	Atomic number	Atomic weight	Boiling point	Melting Point	Density
Fluorine	F	9	19.00	-188 C	-220 C tp	1.70 g/cm3(gas)
Chlorine	Cl	17	34.45	-34 C	-101 C tp	3.21 g/cm3(gas)
Bromine	Br	35	79.90	59 C	-7 C tp	3.12 g/cm3
Iodine	I	53	126.9	184 C	114 C tp	4.92 g/cm3
Astatine	At	85	(210)	337 C	302 C	-

notes: The Halogens are extremely reactive oxidizers, but are most often used in compounds with hydrogen as acids, or in compounds with metals as salts.
Chlorine is a component of ordinary table salt.
Iodine is often used to sterilize wounds and to prepare for surgery.

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