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    why reactivity decreases down the group in group VII(halogens)? Not as in group I
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    (Original post by Popai)
    why reactivity decreases down the group in group VII(halogens)? Not as in group I
    When halogens react they usually gain electrons to form negatively charged anions. As you go down the group, the atoms get larger and the outer electron shell is further away from the positively charged nucleus, meaning it is harder for the larger atoms to attract an additional electron.
 
 
 
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