Halogens are the elements in group 17 of the periodic table. The halogens are a series of nonmetal elements made up by fluorine(F), chlorine(Cl), bromine(Br), iodine(I), astatine(At), and tennessine(Ts).
He very reactive substances. Flourine even reacts with glass, which is known to be quite inert.
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Like all other groups in the periodic table, halogens also follow trends. Their melting and boiling points increase down the group.