Help please it's for my final rn: The more massive the planet the more it has.
-Volume
-Inertia
-Gravity
-Momentum

Typically, the more massive the planet, the more massive the atmosphere it can acquire and maintain.

Explanation:

But a planet's size is not necessarily proportional to its mass. In the end, how massive a planet is has more to do with its composition and density. So while a planet like Mercury may be smaller in size than Jupiter's moon Ganymede or Saturn's moon Titan, it is more than twice as massive than they are.