Name the planet: This greenish-blue planet's axis of rotation is sideways and takes 84 years to revolve around the sun.

uranus

Explanation:

uranus because it's the only planet in the solar system that rotates on its side maybe this was the cause of gravitational force of a much bigger planet

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.