Hedea made a study chart about nuclear energy. which best describes the error in hedea’s chart?

The answer is

D: Fission and fusion convert nuclear energy to both radiant and thermal energy.

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.