When do you need to add a roman numeral to the name of a binary compound?

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The atomic nucleus made up from protons (yellow) and neutrons (blue) and held together by nuclear forces. nuclear forces (also known as nuclear interactions or strong forces) are the forces that act between two or more nucleons. they bind protons and neutrons (“nucleons”) into atomic

Hello.the answer is  hydrosphere, geosphere, and biosphere  have a nice day