What is halogen?
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Poulami Dasgupta 8 years, 4 months ago
The halogens are a <a href="https://en.m.wikipedia.org/wiki/Group_(periodic_table)" title="Group (periodic table)">group</a> in the <a href="https://en.m.wikipedia.org/wiki/Periodic_table" title="Periodic table">periodic table</a> consisting of five chemically related <a href="https://en.m.wikipedia.org/wiki/Chemical_element" title="Chemical element">elements</a>: <a href="https://en.m.wikipedia.org/wiki/Fluorine" title="Fluorine">fluorine</a> (F), <a href="https://en.m.wikipedia.org/wiki/Chlorine" title="Chlorine">chlorine</a> (Cl), <a href="https://en.m.wikipedia.org/wiki/Bromine" title="Bromine">bromine</a> (Br), <a href="https://en.m.wikipedia.org/wiki/Iodine" title="Iodine">iodine</a> (I), and <a href="https://en.m.wikipedia.org/wiki/Astatine" title="Astatine">astatine</a> (At).They are placed in the 17th group of the modern periodic table. Halogens have valency —1 and are highly electronegative
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