These steps result in workable electron dot diagrams, which are also called Lewis Dot Diagrams.
One type of smoke detector uses Americium-241, an alpha source, to detect smoke.
To locate a leak in an underground pipe a very small amount of radioactive material that gives off gamma rays is put into the pipe.
A detector is moved along the ground above the pipe.
Smoke alarm The alpha particles pass between the two charged metal plates, causing air particles to ionise (split into positive and negative ions).
The ions are attracted to the oppositely charged metal plates causing a current to flow.