Which is the largest planet and which is the smallest?

The largest planet is Jupiter. Scientists are studying this planet, but there is little information about it. Jupiter acts as a shield for the Earth, comets collide with him. Its mass is 2 times more than other planets. It has rings, the atmosphere is composed of helium and hydrogen.
Mercury is the smallest planet in the solar system. It can be seen with the naked eye. It is located closest to the Sun. The atmosphere is made of helium. There are no seasons on Mercury. It rotates faster than all planets, has a weak gravitational field.