The commonest element on Jupiter is hydrogen, but not the only hydrogen; helium also is considered the commonest element on Jupiter. Jupiter happens to be the biggest planet in the universe. Though it is the fifth planet to the sun, it is said to have the highest amount of hydrogen after the sun. Jupiter, as well, is made up of gas, and it does not have any solid surface.
This planet is also referred to as the gas giant planet. The planet is made up of hydrogen and helium basically; meanwhile, inside Jupiter, hydrogen can be found to be of liquid and solid like form. As a matter of fact, the most common elements that dominate the whole universe, even the earth, are hydrogen and helium.
Jupiter has a huge red spot and also consists of 67 moons. In the solar system, the fastest spinning planet also happens to be Jupiter, but it takes Jupiter 11.86 years of the earth to complete just a single revolution around the sun. Jupiter has a ring, just like Saturn.