Question

1. electricity is __ travelling through wires. protons neutrons electrons nucleii 18. fission and fusion are two examples of _ energy. chemical thermal radiant nuclear electrical mechanical

Explanation:

For question 17, electricity is the flow of electrons through a conductor like wires. Protons and neutrons are in the nucleus and not responsible for electric current flow, and "nucleii" is an incorrect plural form of "nucleus". For question 18, fission (splitting of atomic nuclei) and fusion (combining of atomic nuclei) are processes that release energy related to the nucleus of an atom, so they are examples of nuclear energy. Chemical energy involves electron - related reactions in molecules, thermal is related to heat, radiant is energy in the form of electromagnetic waves, electrical is related to electron flow in circuits, and mechanical is related to motion and forces.

Answer:

1. C. electrons
2. D. nuclear