Ionic, Compound and Isotopes

Ionic, Compound and Isotopes

1. Atomic number and mass number describe an atom

   • Numbers that tell you how many of each kind of particle an atom has:
     • The Mass Number
       • Total number of protons and neutrons
     • The Atomic Number
       • Number of protons

2. To get the number of neutrons, just subtract the atomic number from the mass number to get the relative mass.

3. Compounds are chemically bonded

   • Compounds are formed when atoms of 2 or more elements are chemically combined
   • It’s difficult to separate the 2 original elements out again

4. Isotopes are the same except for an extra neutron or two

   • A favourite exam question “Explain what is meant by the term isotopes”
     • Isotopes are: different atomic forms of the same element, which have the SAME number of PROTONS but a DIFFERENT number of NEUTRONS

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