Constituents of the atom

• What are the main constituents of an atom

  Neutrons, Electrons and protons
• What is specific charge

  charge/mass
• What is the letter associated with a proton number

  Z
• What is a nucleon

  A constituent of a nucleus: a proton or neutron
• What letter represents nucleon number

  A
• What is an isotope


  A version of an element with the same number of protons but a different number of neutrons