You asked:

what is heavier than lead

  • A substance with higher density than Lead are Palladium, Thallium, Rhodium, Technetium, Ruthenium and Protactinium.
  • Palladium
    Palladium
    Palladium

  • Thallium
    Thallium
    Thallium

  • Protactinium
    Protactinium
    Protactinium

  • Rhodium

  • Technetium

  • Ruthenium