No.
The heaviest naturally-occurring element is uranium (atomic number 92, atomic weight 238.0289).
While the substance with the highest density is either element iridium or the element osmium.
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The refrigerator is the heaviest item in my house.
The Sierra receives some of the heaviest snow in the world.
The 2nd heaviest person in the world, as of 2021, is Jon Brower Minnoch from the United States. He reached a peak weight of around 1,400 lbs (635 kg).
Uluru or Ayers Rock is the largest and heaviest rock in the world.
The heaviest internal human organ is the liver, weighing on average about 3.5 pounds in adult humans.