GCSE P4 TEST REVISION

GCSE P4 TEST REVISION

1. Atomic Structure is made up of protons,neutrons and electrons

   • The number of electrons is always the same as the number of protons
   • Neutrons have a mass of 1 and a relative charge of 0 (no charge)
   • protons have a mass of 1 and a relative charge of 1+ (positive charge)
   • Electrons have a relative mass of 1/2000 ( i.e.0) and a relative charge of 1- ( negative charge)
   • Mass number = number of protons + number of neutrons.

2. Radiation Types

   • Alpha has a charge of 2+ and a mass of 4 amu.
     • Alpha Radiation
       • Least penetrating
       • Positively charged
       • Path bends in a magnetic fiels.
   • Beta has a charge of 1- and a mass of 1/2000th .
   • Gamma has a charge of 0 and a mass of 0 amu.