Jupiter is a gas giant and doesn't have a solid surface like Earth. Instead, it's composed primarily of hydrogen and helium, with trace amounts of other elements like methane, ammonia, and water.

While these compounds are not inherently toxic, they could pose a risk to humans due to their chemical properties. For example:

* Methane (CH4) is a flammable gas that can cause suffocation in high concentrations.

* Ammonia (NH3) is a strong irritant and can cause burns to skin and eyes.

* Water (H2O), while essential for life, could be dangerous in the extreme conditions of Jupiter's atmosphere, which are far too cold and pressurized for humans to survive.

Furthermore, Jupiter's atmosphere is constantly bombarded by radiation from the sun, which can also be harmful to living organisms.

Therefore, while there are no toxic chemicals in the traditional sense on Jupiter, the conditions on the planet and the presence of certain chemicals would make it impossible for humans to survive there.