Radioactive isotope. Radioactive isotope, also called radioisotope, radionuclide, or radioactive nuclide, any of several species of the same chemical element with different masses whose nuclei are unstable and dissipate excess energy by spontaneously emitting radiation in the form of alpha, beta, and gamma rays. 1  A brief treatment of radioactive isotopes follows.
BLM sympathizer Markeith Loyd (Orlando cop killer) caught. Posted on 17 January 2017. BLM sympathizer Markeith Loyd (Orlando cop killer) has finally been caught. Living about five miles away from where he killed one cop and was indirectly responsible for a second copâs it took this long to find the gangbanger thug.
According to police in Orlando, Florida, an AR-15 assault rifle was recovered from Omar Mateen, the 29-year-old Florida man who killed at least 50 people at the gay nightclub Pulse. The AR-15 is the same weapon used by Adam Lanza, who killed 26 people, 20 of them children, at Sandy Hook Elementary School in 2012.