Protons and ____ are found in the nucleus of an atom. Electrons are found in electron ____. The 1st electron shell can have up to ____ electrons, and the other shells can have up to 8. The most stable atoms or ions have ____ electron shells. If a Group 1 atom, such as Lithium (which has 3 electrons), has ____ electron in its outer shell, it will ____ the electron, making it have a ____ charge. A group 7 (Halogen) atom, such as Fluorine (which has 9 electrons), has ____ electrons on its outer shell. To complete its outer shell, it ____ one electron, making it have a ____ charge. Lithium and Fluorine then form an ionic bond, forming a crystal ____. The positive and negative charges ____ one another.

Ionic Bonding

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