ATOMS, COMPOUNDS + ISOTOPES

ATOMS, COMPOUNDS + ISOTOPES

1. Compounds

   • atoms of 2 or more elements
   • chemically bonded
   • difficult to seperate

2. Mass Number

   • Total number of protons + neutrons

3. Atomic Number

   • Number of protons

4. Neutrons

   • atomic number - mass number
     • eg- Na = 23 -11 = 12

5. Isotopes

   • different atomic forms, same element
   • SAME protons
   • DIFFERENT neutrons
   • SAME atomic number
   • DIFFERENT mass number