Isotopes

• Isotope

  • atoms of an element with the same number of protons and electrons but different numbers of neutrons
  • isotopes of an element have: the same atomic number and different mass numbers
  • an isotope is named after the element and the mass number of its atoms
• 3 isotopes of hydrogen

  • all hydrogen atoms contain 1 proton (and 1 electron)
  • they can contain different numbers of neutrons
  • Hydrogen-1 is the most common isotope of hydrogen
  • all 3 isotopes of hydrogen have identical chemical properties
  • the number of electrons determine chemical properties
  • all 3 isotopes have 1 electron in their atoms