Lesson 4: ISOTOPES AND IONS

• Isotopes


  Atoms of a given element that do not have the same mass
• Isotope notation


  Element name or symbol, followed by a dash (-) and the atomic mass

  
• Isotope example


  • Protium (hydrogen-1 or H-1)

  
• Ion


  An atom or molecule with a net electric charge due to the loss or gain of one or more electrons
• Cation


  A positively charged ion
• Anion


  A negatively charged ion
• Ionic compound example


  • Sodium chloride (NaCl) consisting of a sodium cation and a chloride anion
• The atomic number of Sodium (Na) is 11
• When Sodium loses one electron, it becomes a positively-charged ion with a charge of +1