Anion Formation

Anion Formation

1. Anions are the negative ions formed when an atom gains one or more electrons.

2. When nonmetals gain electrons, they gain as much as they need to fullfill their outermost principal energy level with eight electrons.

3. Outer electron configurations are constant within a group, so the pattern of atom formation repeats itself.

4. The outermost prinicpal level is usually an octet.

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