Halogens are diatomic. They exist naturally as molecules in groups of two atoms.
They have low melting and boiling points.
They are the most reactive of nonmetals.
They are nonmetals so they so not conduct electricity.
They have high effective nuclear charge so they are highly electronegative.
http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_pre_2011/periodic_table/group7rev1.shtml
https://www.boundless.com/chemistry/nonmetallic-elements/halogens/properties-halogens/
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