Here's how to figure out the number of fluorine atoms in a disulfur decafluoride molecule:

* Disulfur decafluoride: The name tells us the chemical formula: S₂F₁₀

* Deca- prefix: This means "ten".

* Subscripts: The subscript "10" after the fluorine (F) symbol indicates that there are ten fluorine atoms in each molecule of disulfur decafluoride.

Therefore, there are 10 fluorine atoms in each molecule of disulfur decafluoride.