C2.1 Structure of the Atom

C2.1 Structure of the Atom

1. There are two parts of the atom.

   • Nucleus - This contains the protons and the neutrons and is at the centre of the atom.
     • The amount of protons defines what atom it is.
   • Electron shell - is shells of electrons around the nucleus given in electronic configuration. (2, 8, 8, 4)

2. Isotopes

   • The atomic number of an element is the amount of protons that it has
   • The mass number is the total amount of Particles in the nucleus
   • Isotopes are elements that don't have the same neutrons but the same protons
     • This is why some relitive atomic numbers aren't whole