Although group 7a ions may have different oxidation states depending on which other elements are in the compound, the most common oxidation number for group 7a (group 17) ions is:

1−

3+

5+

7+

1-. Because Group 7A elements have 7 electrons in their valence shell, they need 1 more electron to complete the octet. Thus, it is generally true that all Group 7 electrons have an oxidation number of 1-. This also explains why electron affinity is largely the highest for Group 7A and lowest for Group 1A.

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