Why does a helium balloon float?

Helium is pretty light. It only has 2 protons so gravity doesn’t pull down on it very hard.
Iron has 26 protons so gravity pulls a lot harder on it.
If you fill a balloon full or helium, you are filling it with atoms that are lighter that the atoms and molecules in the air around it. Gravity pulls harder on the air around the balloon. Since air can move around easily, air from the sides of the balloon is pulled down and the balloon gets pushed up (add example / image).

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