How Atoms Form Ions.

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Presentation transcript:

How Atoms Form Ions

How Atoms form Ions An ion is an atom that has a charge The amount of protons and neutrons in an atom are always the same. Atoms have the ability to lose or gain electrons. If an atom gains an e- it will have a charge of -1. If an atom loses an e- it will have a charge of +1.

Why Do Atoms form Ions? All atoms want to be stable. To become stable they want t have a full outer/valence shell. To decide if an atom will gain or lose electrons, think of the easiest way for it to get a full outer shell. We can draw a Bohr diagram of the ion formed for various atoms.

e.g. Lithium Li Li Lithium Ion Lithium Atom 1+ 3p+ 4n 3p+ 4n 1+ We write the symbol for the Ion Li+

e.g. Oxygen O O Oxygen Atom Oxygen Ion 2- 8p+ 8n 8p+ 8n 2- We write the symbol for the Ion O2-

Ion Formation Worksheet page 15 Let me know if you need help.