The Atom

The Atom

1. Sub-Atomic Particles

   • Proton
     • In the nucleus
     • 1.a.m.u
     • +1
   • Neutron
     • 1 a.m.u
     • In the nucleus
     • 0
   • Electron
     • 1/1840 a.m.u
     • Orbiting the nucleus
     • -1

2. The atomic number of an atom is the number of protons it has in it's nucleus

   • Mass number = number of protons + neutrons

3. Isotopes are atoms of the same element, which have different numbers of neutrons