Chemistry: Ions

Chemistry: Ions

1. Atoms have same number of protons and electrons

   • = No overall charge

2. Atoms become ions when they lose or gain electrons

   • ie, They no longer have equal protons and electrons

3. Cations

   • "I positively hate cats"
   • Atom loses electrons so becomes positive
   • Metal atoms lose electrons

4. Anions

   • Negative charge (gain electrons)
   • Non-metal atoms gain electrons

5. Metal atoms always lose electrons

6. Non-metal atoms always gain electrons

7. Examples

   • Calcuim
     • Metal in group 2
       • Loses 2
     • Ca^2+
   • Flourine
     • Non-Metal
     • F^-