earth
Many of the planets have more than one element. Two of these planets that have more than one element are Earth and Jupiter.
Jupiter is the one with the vapor atmosphere
The question seems reversed. All but two of the planets have at least one moon. The only planets that don't have any moons are Mercury and Venus.
Only Mars has two moons. The other planets have either one moon, no moons, or many moons.
Only the Earth has one moon.
There are the inner, terrestrial planets, also know as the rocky planets. Earth is one of these. Then there are the outer planets, also know as the gas planets or gas giants.
Mercury and Venus. These two planets have no known moons.
Yes we can! And we have! Several planets and moons have water on them!
Water in some form has been discovered on most if not all the solar planets. This is not terribly surprising, since water is composed of the two most common reactive elements in the universe. (Helium is more common than oxygen, but it is not reactive.)
The other two planets are Mercury and Venus.
Neptune and Pluto are the two coldest planets!
None of those in out solar system do. Of the four terrestrial planets in our solar system, two have moons. Earth has one moon while Mars has two. The Jovian planets all have numerous moons.