-Basic chemical properties of halogens is strong oxidative properties, due to ngtử have 7 e outer layer (ns2 np5) should tend to heartland is getting more 1e creating ion halides to have configured e similar sustainable gases (ns2 np6).
-causes the oxidative properties of the halogens decreases from F to Iot.
-why ngtố f only of oxidative-1, While the addition of halogens, oxidation-1 also has a 1, 3, 5, 7.
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