Atomic Structure (Protons, Neutrons & Electrons)

Atomic Structure (Protons, Neutrons & Electrons)

1. Sub-atomic particles

   • Protons
     • +ve charge
     • Relative mass: 1
   • Neutrons
     • No charge
     • Relative mass: 1
   • Electrons
     • -ve charge
     • Relative mass: 1/1840

2. Behaviour of sub-atomic particles in electric fields

   • Protons
     • deflected on a curving path towards the negative plate
   • Neutrons
     • continues on in a straight line
   • Electrons
     • deflected on a curving path towards the positive plate.

3. the distribution of mass and charge within an atom

   • Positively charged nucleus containing most of the mass, surrounded by atomic shells with orbiting electrons of negative charge and negligible mass.

4. Deduce the numbers of protons, neutrons and electrons present in atoms

   • Atomic # = # of protons = # of electrons
     • # of protons - mass # = # of neutrons