Science Atoms T1

Science Atoms T1

1. Why + and - ions are attracted to each other

   • Attract to one another because they are opposites

2. Work out the charge of an ion

   • Gain electron/s = negative charge
   • Lose electrons = postitive charge

3. Why atoms are neutral

   • Atoms are neutral because they have the same amount of negative and positive charge in the atoms

4. Why atoms lose or gain electrons

   • Atoms lose or gain electrons so they can have a full shell

5. Electron configuration

   • Electron configuration shows the number of electrons in each shell
     • Eg. Lithium = 2,1
     • There is always 2 on the first shell
     • The total number of electrons in a shell is 8

6. Formula for compound

7. Calculate protons, neutrons and electrons in an ion

8. Explain why ions have a charge

   • Ions have a charge because they lose and gain electrons

9. Naming ionic compunds