Question

what did scientists use to create superheavy elements in the 20th century? chemical reactions nuclear reactors particle accelerators electric furna

Explanation:

Superheavy elements have extremely large atomic nuclei that cannot be formed through chemical reactions, nuclear reactors, or electric furnaces. Particle accelerators work by speeding up atomic nuclei to high speeds and smashing them into target nuclei, which can fuse to create these heavy, man-made elements, and this was the method used in the 20th century.

Answer:

Particle accelerators