Atomic Structure

• Proton

  • Location: in the nucleus
  • Mass: 1 amu
  • Charge: +1
• Neutron

  • Location: in the nucleus
  • Mass: 1 amu
  • Charge: neutral
• Electron

  • Location: orbits nucleus
  • Mass: virtually none
  • Charge: -1
• Atomic number = number of protons
• Number of neutrons = mass number - atomic number
• Isotopes

  • Same atomic number
  • Different mass number
• The mass number are an average number between different isotopes
• Number of protons = Number of electrons
• Mass number = number of protons + number of neutrons