Why are non-metals placed into seperate groups - halogens and noble gases?
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Explanation:
because halogens non metals are no fulFIL his octet and noble gas are completely filled his shell
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Periodic table has been built up in such a way that all the substances that shows nearly same chemical behaviours are placed in the same group and a group should not contain those substances that differs in such behaviour from the other ones of that group. You can easily understand the usefulness of this kind of formation. It’s easier to learn the common features of the substances of a group than to learn individually of all the substances. That’s why halogenes are in the 17th group. Noble gases in the 18th. And the non-metals are placed in different groups according to their chemical nature.
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