Earthed - How do the densities of the inner planets compare to those of the outer planets? Why do they differ?

How do the densities of the inner planets compare to those of the outer planets? Why do they differ?

The inner planets are all made of heavy elements, so they are much denser then the outer planets; which are made of mostly gad and some liquids. The inner planets are made out of heavier elements because while the sun was forming asteroids and alrge space debris orbited the sun's pre-fusion central mass close to the sun. The larger asteroids were then rounded by gravity and became planetoids in the inner solar system. Outser planets were originally large clumps of gas just like the sun was, but they orbited the suns central mass and were not alrge enough to engage fusion reactions. They all eventually rounded due to gravity, collected much of the loose gas in the early solar system (even taking many small asteroids as their moons) and continued orbiting the sun.