the sun
No. The gravity on Mercury is less than half that of Earth.
Mars has less gravity.
Planets with a smaller surfae gravity than Earth are Mercury, Venus, Mars, and Uranus.
The "surface gravity" is less on Uranus.
because it has less mass.
No. My planet (and presumably yours as well) is Earth.
Mercury does not have extreme gravity. Its gravity is only 38% of Earth's. If you are talking about Jupiter, then yes.
I'm not sure if it's half or not, probably less, but the only possibility would be Mercury. True. Mercury is the only one. Gravity on Mercury's surface is 37% of what it is on Earth. Except for Mars, where it's 38% of its value on Earth. Mercury and Mars are the only ones. Except for Pluto, where it's 4% of its value on Earth.
Pluto but if you dont count that as a planet then Mercury.
No, the gravity of this planet will not be greater than that of earth. If the new planet has a mass equal to that of earth, its total gravity will be the same. There is a little ambiguity regarding 4 times earth density and half the earth's diameter if the idea is to keep the mass of this proposed planet the same as the earth. But setting that aside and assuming that the mass of the new planet is the same as earth's, the gravimetric field will be the same. Gravity is proportional to mass, and identical mass yields identical gravity. Now to the good part! The surface gravity of the new planet will be considerably higher than the surface gravity of earth. Both planets have the same mass and the same gravity, but a person standing on the surface of the new planet will be experiencing a whole lot more force pulling on him. All the mass of the new planet is beneath this person, but he's a lot closer to the center of gravityand will weigh a whole lot more.
It could be mars.
Io is a moon of Jupiter, not a planet. Surface gravity is about 18% of the gravity on Earth.