Atomic Structure

Atomic Structure

1. Atoms

   • Made up of 3 smaller kinds of particles (sub-atomic particles)
     • Electrons
       • Move around in a fixed orbits in the electron shells
     • The nucleus (positively charged) is made up of
     • Protons
     • Neutrons
   • Electrically neutral
     • Number of protons=Number of neutrons

2. Nuclide notation

   • • m
       • Mass number/ Nucleon number
     • p
       • Proton number/ Atomic number
     • X
       • Symbol of the atom