Most substances are found combined in nature. They are more ______________________ this way than the elements were while uncombined because they now have full outer shells.
The rest of the elements in the Periodic Table will react to fill their outer shells by:
1. ______________________ electrons from the outer shell (forming cations)
2. ______________________ electrons to the outer shell (forming anions)
3. ______________________ electrons in the outer shell
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