what are halogen placed in a separate column
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Halogens are extremely reactive elements because they need one more electron to gain a full octet state while noble gases are extremely unstable because they already have their full octet state, hence they are placed in separate groups of the periodic table.
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Group 7A (or VIIA) of the periodic table are the halogens: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).
The halogens are located on the left of the noble gases on the periodic table. Because the halogen elements have seven valence electrons, they only require one additional electron to form a full octet. This characteristic makes them more reactive than other non-metal groups
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