20 write the word that completes each sentence correctly. protons and neutrons are located in the of an atom.

Protons and neutrons are located in the center of an atom.

They are in the nucleus

for example, no new evidence will demonstrate that the earth does not orbit around the sun (heliocentric theory), or that living things are not made of cells (cell theory), that matter is not composed of atoms, or that the surface of the earth is not divided into solid plates that have moved over geological timescales .