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Oxygen is less dense.
This riddle is referring to Radon-222, a dense noble gas that is a byproduct of uranium-238 decay and is radioactive. Radon is colorless, odorless, and tasteless, making it hard to detect without proper testing. It can seep into homes through cracks and openings in the foundation, so it is important to regularly test for radon and take necessary precautions to prevent exposure.
The heviest element is mercury. It is heavy because it is so dense.
Osmium is the most dense element.
silver
Mercury is more dense.
Fibers
Copper i assume
Ununbium is an extreamly dense element, elemental # 112. is has 112 protons and electrons.
'Lead' is a dense, metallic element.
Which element changes the density of matter
Lead.