1. Ions When atoms lose or gain electrons

2. Proton = + charge Neutron = neutral charge Electron = - charge Structure of an Atom

3. Ions Ions are atoms that have lost or gained one or more electrons giving them a positive or negative charge!

4. For example: Na (Sodium), has originally 11 electrons but when an electron is lost it becomes a postive ion. Na + If an ion losses an electron it has a positive charge. If an ion gains an electron it has a negative charge. Ions

5. What causes an atom to become an ion? When an atom loses or gains one or more electrons it acquires a net electrical charge called an ion. The net charge of an ion is found by subtracting the number of electrons from the number of protons Charge of Ion = number of protons – number of electrons Repeat Ions!

6. A neutral magnesium atom (atomic number=12) has 12 protons/electrons. If it loses 2 electrons it becomes an ion with a charge of 2+. Number of protons 12 Number of electrons - 10 Charge of Ion 2+ Lets give it a try

7. 29. Cu²+ 9. F- 29 9 Ion Protons Electrons 27 10 Examples

8. You Try 10 23 10 48 25 Cl -1 18