Chemical Elements | Part 9 | Actinides
Radioactive elements that are abundant in nature (elements 89 to 92) or made artificially (elements 93 to 103). Most of them have no industrial applications.
thermonuclear explosion = a massive release of energy caused by nuclear fusion, where light atomic nuclei combine at extreme temperatures, typically triggered by an initial nuclear fission(=a physical reaction where the center (nucleus) of a heavy atom splits into smaller parts, releasing a massive amount of heat, radiation, and extra neutrons)
spacecraft propulsion = any method used to accelerate or change direction of a spacecraft or artificial satellites in outer space
photoelectric cell = an electronic device that changes light into an electric signal or current
thermoelectric generator = a solid-state device that converts temperature differences directly into electrical energy