Structure of atom

• • Atoms are very small
  • Have radius of 10^-10nm
• • Atom is positively charged nucleus with negatively charged electrons
  • Radius of nucleus is 10000 rimes smaller than radius of atom
• • Electrons are arranged at different distances from nucleus - different energy levels
  • Gaining energy by absorbing EM radiation moves electrons to higher energy level, further from nucleus
  • Losing energy by releasing EM radiation moves electrons to lower energy levels, closer to nucleus