How many electrons are in the outer shell of group 7?

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Multiple Choice

How many electrons are in the outer shell of group 7?

Explanation:
Valence electrons in main-group elements equal the group number, so group 7 has seven electrons in the outer shell. This outer shell is nearly full (a full octet is eight), which is why these elements readily gain one electron to achieve a stable configuration. So the outer shell contains seven electrons. Five or six would be the valence count for groups 5 or 6, and eight would mean a complete octet, which isn’t characteristic of group 7.

Valence electrons in main-group elements equal the group number, so group 7 has seven electrons in the outer shell. This outer shell is nearly full (a full octet is eight), which is why these elements readily gain one electron to achieve a stable configuration. So the outer shell contains seven electrons. Five or six would be the valence count for groups 5 or 6, and eight would mean a complete octet, which isn’t characteristic of group 7.

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