current model of the atom

current model of the atom

1. Nucleus

   • It is tiny but makes up most of the mass.
   • contain protons (relative charge +1) (relative mass is 1)
   • contains neutrons (relative charge 0) (relative mass 1)
   • the radius is about 10,000 times smaller than the atom's radius
   • number of protons = number of electrons

2. Atom

   • Mostly empty space

3. Electrons

   • If they gain energy (absorbing radiation) they move to a higher energy level, further from the nucleus
   • If they release radiation then they move to a lower energy level, closer to the nucleus
   • If one or more outer electrons leave the atom, the atom becomes positively charged
   • relative charge -1
   • relative mass 0