Gradation in halogen family- Needs
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all halogens have one electron less in their outermost shell. one shell increses top to bottom.so attraction between nucleus and outermost shell decreases. so in halogens family reactivity decreases from top to bottom. Flourine is most reactive and astatine is least reactive
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The group 17 contains the members of halogen family. all the general formula X2 a graduation is observed in the their physical state down the group. the non_ metallic element fluorine (F2) and chlorine (Cl2) are gases , bromine (br2) is a liquid while iodine ( I2) is a solid.
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