Atoms, Compounds and Isotopes

Atoms, Compounds and Isotopes

1. Periodic Table Numbers

   • Mass Number: Total number of protons and neutrons
   • Atomic Number: Number of Protons

2. Compounds

   • Chemically Bonded
   • Difficult to separate the two original elements
   • ^^Examples of compounds^^

3. Isotopes

   • They are the same element
   • They have a slightly different amount of neutrons
   • Same number of protons and electrons

4. Ionic Bonding

   • If the atom nearly has a full shell it will gain an electron.
   • If the atom doesn't have a very full shell then it will lose an electron
   • Ionic compounds have a REGULAR LATTICE structure
   • Ionic Properties
     • They have high melting/boiling points due to strong attraction between ions
     • They carry and electric current when melted. This is because the ions are free to move
     • They dissolve easily in water. This also allows for electric current to flow through it because of the free ions.

5. Ions and formulas

   • Atoms that have lost or gained electrons are ions
   • Positive and Negative Ions
     • Negative
       • Group 6
       • Group 7
     • Positive
       • Group 1
       • Group 2
     • Negative and positive ions can attract to form an Ionic compound

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